Topographies/topologies of the camp: Auschwitz as a spatial threshold

This paper, largely inspired by Giorgio Agamben’s conceptualization of the camp, reflects on the relationship between the ‘topographical’ and the ‘topological’ in reference to Auschwitz-Birkenau and its spatialities. After having discussed the concept of soglia (threshold), we briefly introduce the ways in which the historiographical literature on the Holocaust treats the relationship between modernity, rationality, and Nazism. The second part of the paper is dedicated to an attempt to read ‘geographically’ the entanglements between the camp, Nazi spatial planning, bureaucratic rationalities, and the Holocaust. The notion of the camp-as-a-spazio-soglia is central to this interpretation. Auschwitz, conceived as a metaphorical and real space of exception, is contextualized within the broader regional geography planned by the Nazis for that part of Poland; while ‘Mexico’, a specific compound within the camp, is described as a key threshold in the reproduction of those very geographies. The aim is to show how the topological spatialities of the camp were a constitutive element of the overall biopolitical Nazi project of ‘protective custody’ and extermination and that, for this reason, they deserve further investigation and need to be discussed in the relation to the crude calculative and topographical aspirations of that same project.     

The plebe in the Florentine Histories: Machiavelli’s notion of humours revisited

According to recent scholarship, the Florentine Histories expresses Machiavelli’s growing scepticism toward the popolo. This more elitist ‘late Machiavelli’, however, is an illusion. I show that the illusion arose from (1) the scholarly oversight of Machiavelli’s criticism of the popolo in his early work, Discourses, and (2) the failure to notice his new terminological distinction between the popolo and the plebe in the Florentine Histories. Machiavelli never was a whole-hearted defender of the popolo in the first place, for his consistent commitment was to preserve the balance between the popolo and the grandi. Nor was he unusually critical of the popolo in his later work, Florentine Histories: he directs his harshest criticism to the lower-class plebe and not to the middle-class popolo.     

Meaning in a Changing Context: Towards an Interdisciplinary Approach to Authorial Revision

Summary

In this article, I seek to develop a genetic/diachronic approach to the phenomenon of authorial revision, and to the interpretation of texts that exist in multiple versions. In all such cases, the reconstruction of textual meaning cannot be separated from the reconstruction of the process through which the text in its ‘final’ form came into being; furthermore, an understanding of the author's intentions in (re)writing cannot be entirely separated from an understanding of his/her motives for (re)writing. This article is divided into three sections. In the first section, I consider recent trends in editorial and literary theory that aim at characterising texts in terms of processes rather than products, in order to uphold the equal dignity of each version without losing sight of its connectedness to other stages in the history of the text. In the second section, I discuss how Quentin Skinner's views on meaning and context apply to cases of authorial revision, and I suggest that some key aspects of Skinner's contextualism need to be reconsidered. In the concluding section, I focus on a case study in order to demonstrate the operational value of such a genetic and motive-based approach to authorial revision: more particularly, I seek to show how a close examination of Jean Bodin's rewriting practices in the Methodus (1566–1572) and the République (1576) can throw new light on his shift from a concept of limited sovereignty to one of absolute sovereignty.     

Thomas Fitzherbert's reason of state

Thomas Fitzherbert's two-part Treatise concerning Policy and Religion (1606, 1610) was a rebuttal of unidentified Machiavellians, statists or politikes and their politics and policies. The work was apparently still well-regarded in the following century. Fitzherbert's objections to ‘statism’ were principally religious, and he himself thought the providentialist case against it unanswerable. But for those who did not share his convictions, he attempted to undermine Machiavellism on its own ground. Like both ‘Machiavellians’ and their opponents, he argued by inference from historical examples, but with a particularly copious knowledge of historians ancient, medieval and modern to draw on. Equally, however, he deployed the principles of speculative (principally Aristotelian) ‘political science,’ as well as theology and jurisprudence, to demonstrate that the kind of knowledge that Machiavellians required to guarantee the success of their ‘reason of state’ policies was simply unobtainable. A particularly striking strategy (perhaps modelled on that of his mentor and friend Robert Persons) was Fitzherbert's attempt to demonstrate, on the Machiavellians’ own premises, that they advocated policies which were very likely to fail, and would be visited with divine punishments sooner as well as later, whereas policies that were compatible with faith and morals were also much more likely to succeed, even judged in purely human and ‘statist’ terms.     

Harnessing the waves: Monuments and ceremonial complexes in Orkney and beyond

Utilising recent observations by Phillips (2003) on the location of chambered cairns in Orkney in relation to the sea this paper attempts to explain why megalithic monuments cluster in particular locations. In the past, the distribution of cairns has been related to the levels of survival in marginal locations. However, monument locations, from across Scotland, demonstrate that clustering was a feature of monumental distribution in the past. From a maritime perspective it becomes easier to understand these groupings in Orkney as the product of interactions between widely dispersed island communities. Utilising a long-term perspective it is possible to use the relative patterning of monuments of different ages to suggest the changing audiences to whom these monuments were addressed. For example, the clustering of Earlier Neolithic monuments in Orkney, in places that form important linking locales, suggests a role for these monuments involving establishing and maintaining links between island groups within the Orkney archipelago. The location of later Neolithic monumental complexes, on the other hand, suggests the importance of inter-regional maritime contact at precisely the time when such contacts are strikingly evident in the archaeological record. It is argued that a closer integration of our approaches to land and sea is needed if we are to understand the nature of long distance contacts in the past.

Too little,too late: the geochemistry of a 1773 Philadelphia porcelain openwork basket

A dated (1773) openwork basket labelled “PHILADELFIA” attributed to the Bonnin and Morris factory has a lead-bearing, silicious–aluminous–calcic (S-A-C) composition that contrasts with the phosphatic (bone ash) porcelains known to have previously been made during the mid-1760s to early 1770s in what is now the United States. The basket was underfired and so contains relics of a flint (Pb) glass flux, but kiln temperatures were nonetheless sufficient for subsolidus pseudowollastonite and anorthite to have been resorbed, implying that the duration of firing (soaking) near peak kiln temperatures was insufficient to ensure thorough vitrification. During cooling, liquidus pseudowollastonite and silica polymorphs (but not anorthite) formed, showing that the melt was confined to the tridymite–pseudowollastonite cotectic above the Trd–Wol–An eutectic (1170 °C) in the SiO₂–Al₂O₃–CaO system. Rapid cooling is also indicated by quenched silica polymorphs in the relict glass particles. Although Bonnin and Morris employed some former Bow (London, c. 1743–74) workers, the S-A-C wares initially produced by this factory are compositionally distinct from the 1773 basket, which in this regard more closely resembles the body and glaze of a reputed Chelsea triangle-period (London, c. 1745–49) vessel. Regardless of how they obtained this technology, it is ironic that Bonnin and Morris chose to abandon phosphatic pastes in favour of what in Britain had become an obsolete formula.     

Stable isotopes in human skeletons of Southern Ontario: reconstructing Palaeodiet

Most native plants of Ontario use the C₃ photosynthetic mechanism and therefore have relatively low ${}^{13}\text{C}{}^{12}\text{C}$ ratios; maize is a C₄ plant and is relatively enriched in ¹³C. The proportion of maize in the diet of a human can therefore be estimated from the ¹³C-content of collagen of fossil bone. We have used this method to follow the increase in consumption of maize in ancient native populations over the interval from AD 400 to 1650, and to quantify the amount of maize consumed. Maize consumption rose gradually to a maximum of 50% of the diet by AD 1400. These data agree with archaeologically derived data for this region, and with previous isotope studies in the northeastern U.S.A. In some of the latter, however, the maximum percentage of maize consumed has been overestimated because maize was assumed to have a δ¹³C value of ?12·5‰; our studies of archaeological specimens show the correct value to be closer to ?9‰. The introduction of beans into the native diet about AD 1100, should have caused a decrease in the ¹⁵N content of human bone collagen because legumes are deficient in this isotope, with respect to meat and fish. However, we observe no significant change in the ${}^{15}\text{N}{}^{14}$N ratio of human bone collagen over the period from 2300 BC to AD 1640. We conclude that meat and fish remained the main sources of protein even after the advent of agriculture into this region.     

Late Holocene human impact on the vegetation around Mizorogaike Pond in northern Kyoto Basin,Japan: a comparison of pollen and charcoal records with archaeological and historical data

Pollen and macroscopic charcoal analyses of AMS radiocarbon-dated sediment from Mizorogaike Pond, located near Japan’s ancient capital established in AD 794, were used along with archaeological and historical data to reconstruct vegetation change in the northern Kyoto Basin since 7300 cal yr B.P. Between ca. 7300 and 3400 cal yr B.P. (Early to Late Jomon period), the site was surrounded by warm-temperate forest composed of Quercus subgenus Lepidobalanus and Q. subgenus Cyclobalanopsis with Celtis/Aphananthe trees. With the occurrence of fire disturbance, Q. subgenus Lepidobalanus increased from ca. 3400 to 1400 cal yr B.P. (Late Jomon to Kofun periods). In the early seventh century (Asuka period), Pinus started to increase, coinciding with a significant charcoal peak, probably related to the operation of roof tile kilns near the site. Pinus continued to increase and Q. subgenus Cyclobalanopsis decreased through the seventh to tenth centuries (Asuka to Heian periods). Further increase of Pinus occurred in the eleventh century, possibly reflecting the establishment of the manor of Kamigamo Shrine. From the eleventh to seventeenth centuries (Heian to medieval periods), no significant vegetational change or fire disturbance took place. In the eighteenth century, the landscape became totally open, with poor vegetation and sparse Pinus woodland. The medieval and early modern landscapes reconstructed from the palaeoecological record are rather similar to those described from studies of ancient artwork and historical documents. This study demonstrates that late Holocene vegetation change in the northern Kyoto Basin was closely tied to anthropogenic activities, such as the pottery industry and fuel wood collection.     

Slag inclusions in iron objects and the quest for provenance: an experiment and a case study

Slag inclusions are found within most archaeological bloomery iron artefacts and are remainders of slag created during the smelting and smithing processes. Although they are widely believed to provide data with the potential for provenancing iron artefacts, previous slag inclusion studies have mostly proven inconclusive. The main aim of the work reported here is to analyse experimental smelting and smithing assemblages (including ore, furnace lining, fuel and slag), to compare these to slag inclusions in the resulting bloom and worked objects, and then explore the relationships between ore, slag and slag inclusions. This study has revealed that the composition of slag inclusions most closely relates to the smelting slag produced, whereas provenance to a specific ore would be difficult due to the chemical variability derived from furnace lining, fuel and any fluxes used. Some compounds in the slag inclusions are particularly affected during smithing of the artefact, i.e. those present in the sand flux and fuel used. However, trends are observed in the K₂O/MgO, MnO/SiO₂, Al₂O₃/SiO₂, Al₂O₃/MgO, Al₂O₃/K₂O and Al₂O₃/CaO ratios that allow comparison between slag inclusions and smelting slag in these experiments, and may therefore be used during other provenancing attempts. The knowledge gained from the experimental assemblages was subsequently applied to an archaeological case study, examining objects from the 900 Cal BC smithing site of Tel Beth-Shemesh, Israel and the 930 Cal BC smelting site of Tell Hammeh, Jordan. The analyses suggest that none of the artefacts examined derived from the Hammeh smelting system.     

Mössbauer Spectroscopic and Chromaticity Analysis on the Colourative Mechanism of Ancient Goryeo Celadon from GangJin and Buan

In ancient Goryeo celadon excavated from the kiln sites in the GangJin and Buan areas, the effect of the chemical composition and ionic state of Fe on the colour was evaluated by Mössbauer spectroscopy and chromaticity analysis. According to chromaticity analysis, the L* value (brightness) of the glaze was shown to be affected more by TiO₂ and MnO than by Fe₂O₃, and the body was affected more by Fe₂O₃ than by TiO₂. The a* value was found to be affected by Fe₂O₃ and TiO₂ in the glaze, whereas there was hardly any change in the body according to the composition. As for the b* value, changes due to the composition were shown to be smaller than those for the L* and a* values. According to the Mössbauer spectroscopy results, as the quantities of TiO₂ and Fe₂O₃ are increased, Fe²⁺/Fe³⁺ decreases; while the changes in Fe²⁺/Fe³⁺ with MnO and P₂O₅ are negligible. As the quantity of Fe²⁺/Fe³⁺ increases, the a* and b* values decrease, which results in the change of colour from red–yellow to blue–green. The characteristic green colour can be attributed to increased L* (brightness) and decreased a* and b* values (blue–green shift) due to the reduced Fe ion, which is mainly determined by the TiO₂ and Fe₂O₃ contents.     

Macropodines from the Pliocene Otibanda Formation,Papua New Guinea

Newly collected material of macropodines from the Otibanda Formation, P.N.G., includes previously unknown elements from described taxa, as well as material of a new and plesiomorphic macropodine, Watutia novaeguineae gen. et. sp. nov. Known only from adult upper and lower cheek tooth rows, this species shows a close similarity to undescribed macropodines of Tertiary age from northwestern Queensland and Hadronomas puckridgi from the Miocene of the Northern Territory, Australia. The upper molar row assigned to Dorcopsis sp. by Plane (1967), but regarded to be more closely related to Dendrolagus by Woodburne (1967), is here interpreted to be closer in morphology to species of Dorcopsis than Dendrolagus.     

The Origins of American Expansion in Hawaii and Samoa, 1865–1900

From Nixon to Reagan, official US perceptions of West German trade with the Soviet Union (Osthandel) underwent a remarkable evolution. Despite initial skepticism, the Nixon and Ford administrations placed no major obstacles to West German–Soviet economic relations. Carter, however, changed the situation. His stance on human rights and economic sanctions against the Soviets for various developments - along with his belief that West Germany should follow the United States' lead - led Carter to ask Schmidt to curtail Osthandel, an action that contributed to Schmidt's notoriously poor relationship with the US President. Despite coming from a different political party, Reagan initially continued Carter's outlook on Osthandel. Yet rather than emphasize human rights, he publicly stressed Poland's self-determination as the reason to implement his aggressive policy to curb trade with the USSR, even though his advisers feared the strategic implications of greater German dependence on Soviet energy. Carter's and Reagan's early approaches were ineffective. Their actions, especially the latter's, strained US relations with Germany, the United States' most important ally in central Europe. Equally important, both Carter's and Reagan's policies undermined détente with Moscow. Because Nixon and Ford's approach to Osthandel harmed neither US–German relations nor US–Soviet relations, these presidents' responses had conspicuous advantages over succeeding administrations.     

Phylogenetic analysis of the Panochthini (Xenarthra,Glyptodontidae), with remarks on their temporal distribution

Zamorano, M. & Brandoni, D., 2013. Phylogenetic analysis of the Panochthini (Xenarthra, Glyptodontidae), with remarks on their temporal distribution. Alcheringa 37, 1–10. ISSN 0311-5518.

To test the monophyly of Panochthini, a phylogenetic analysis including all the species traditionally referred to the tribe was conducted. The matrix included 16 species of Glyptodontidae and 35 characters, from which 14 correspond to the skull, four to the dentition, two to the cephalic armour, nine to the dorsal carapace and six to the caudal sheath. Propalaehoplophorus australis (Propalaehoplophorinae) was used to root the trees. Four most parsimonious trees were obtained (Tree Length = 75, CI = 0.65, RI = 0.70). The strict consensus tree (Tree Length = 77, CI = 0.64, RI = 0.68) has the following topology: Propalaehoplophorus australis (Glyptodon reticulatus (Hoplophorus euphractus (Panochthus jaguaribensis, P. intermedius (P. frenzelianus, P. tuberculatus (P. subintemedius, P. greslebini)))) ((Pseudoplohophorus absolutus, Plohophorus figuratus) (Nopachtus cabrerai, N. coagmentatus, Propanochthus bullifer, Stromaphorus compressidens, Phlyctaenopyga ameghini))). The results indicate that: 1, Panochthini is not a natural group but polyphyletic; 2, Panochthus is monophyletic and, concordant with recent proposals, Hoplophorus euphractus is its sister group; and 3, Nopachtus and Propanochthus are more closely related to species traditionally referred to ‘Plohophorini’ than to Panochthus. Nopachtus and Propanochthus, as the ‘Plohophorini’, are recorded from the latest part of the Neogene, whereas Panochthus and Hoplophorus euphractus are restricted to the Quaternary.

[Martín Zamorano [marzamorano@fcnym]unlp.edu.ar], Departamento Científico Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque, s/n, 1900, La Plata, Buenos Aires, Argentina. CONICET. Diego Brandoni [dbrandoni@cicyttp.org.ar], Laboratorio de Paleontología de Vertebrados, Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción (CICYTTP-CONICET), Matteri y España, E3105BWA Diamante, Entre Ríos, Argentina. Received 25.10.2012; revised 11.1.2013; accepted 18.1.2013.     

Behind the form: A historical analysis of the agriculture encouragement system in the Song dynasty

Using the political culture analysis method, this paper discusses the origin, contents and functions of the agriculture encouragement system of the Song dynasty, which originated from the pre-Qin period (221–207 BC). The main content of this system in its early stage is that in the early Spring days, the king symbolically ploughed a piece of land near the suburbs of his capital in order to send to his subjects a clear message of the importance he attached to agriculture. It was expected that peasants would be encouraged by his majesty’s guidance, and thus agricultural production of the countryside would be promoted. With the rationalization of the political system since the Qin period, agricultural encouragement gradually became a routine work of the Chinese governments at different levels. Under the Northern Song dynasty (960–1127), “agricultural encouragement envoy” was added to the official rank of heads of counties and prefectures. They each were required to take the responsibility of persuading peasants in their jurisdiction to work harder in the field. The actual work as an “agricultural encouragement envoy” in the Song dynasty was to go to the countryside to reward peasants with food and wine in early February, and to write an essay to express his encouragement, and to distribute it to the peasants. Formalistic as it is, the agricultural encouragement system is a typical manifestation of the traditional Chinese political culture. As one of its social impacts on the Song society, it helped the spread of advanced agricultural technology with its institutional basis. __________ Translated from: Zhejiang Daxue Xuebao, Renwen Shehui Kexue Ban 浙江大学学报: 人文社会科学版 (Journal of Zhejiang University, Humanities and Social Science), No. 1, 2004     

Stable carbon- and nitrogen-isotope ratios and electron spin resonance (ESR) g-values of charred bones: changes with heating and a critical evaluation of the utility of g-values for reconstructing thermal history and original isotope ratios

Changes in the stable carbon and nitrogen isotope ratios of modern bone samples heated to a variety of times and temperatures were used to determine the effect of heating on isotope ratios and the retention of organic matter in charred bones. For organic extracts produced by slow demineralization in weak acid, δ¹³C values were unchanged, while δ¹⁵N values increased by up to 5‰ and were primarily determined by heating temperature. Changes in the electron spin resonance (ESR) g-value of whole bone and organic extracts were also measured. For organic extracts from charred bones, the g-value was well-correlated with δ¹⁵N and temperature, suggesting that g-values could be used to estimate the charring temperature and original δ¹⁵N values of charred bones. Thus, g-values from demineralized extracts could be very useful in forensic investigations where it would important to reconstruct the thermal history of burned bones. Isotope ratios and g-values of demineralized extracts from four prehistoric components at three sites that produced cremated human bone were used to test whether the same approach can be applied to archaeological materials. While carbon isotope ratios of the prehistoric samples were similar to those of uncharred specimens, nitrogen isotope ratios were increased and the g-value corrections for nitrogen isotope ratios were not effective.     

Black Death in the rural cemetery of Saint-Laurent-de-la-Cabrerisse Aude-Languedoc,southern France, 14th century: immunological evidence

An excavation carried out in 2007 in Saint-Laurent-de-la-Cabrerisse (Aude-Languedoc, southern France), revealed a medieval rural cemetery used during the 8th–14th centuries. One hundred and forty nine graves were identified. Amongst those, three burials radiocarbon dated to the 14th century contained the remains of several individuals. No paleotraumatological evidences of violence due to warfare or to a civil massacre were identified in the exhumed skeletons. Therefore, we hypothesized that the simultaneous inhumations could have occurred during the “Black Death” outbreak or during one of its resurgences. A rapid diagnostic test for the detection of Yersinia pestis F1 antigen was applied to the nine putative plague victims to authenticate the cause of their death. Seven of the nine individuals tested from the three graves were positive to Y. pestis F1 antigen. We additionally tested fourteen skeletons from single graves archaeologically dated to the 13th–14th centuries. Four of them were positive to Y. pestis F1 antigen, thus showing a higher mortality rate due to plague than originally expected. The Saint-Laurent-de-la-Cabrerisse plague victims are the oldest samples from which Y. pestis F1 antigen has been, hitherto, identified. Few rural French cemetery containing plague victims have previously been identified and amongst them, only one dates to the 14th century. In the present report, we provide suggestive evidence of a second rural cemetery from southern France where victims of Y. pestis infection were buried. Our findings provide new information about the management of the plagued corpses during the “Black Death” in small rural communities.     

The effect of charring and burial on the biochemical composition of cereal grains: investigating the integrity of archaeological plant material

Stable isotope analysis of charred archaeobotanical cereal grains has the potential to provide direct evidence of crop growing conditions in the past and to refine palaeodietary predictions. If isotope values of archaeobotanical material are to be considered robust, it is necessary to characterise the compositional changes associated with their charring and burial. This study used a suite of analytical techniques, including FT-IR and solid state ¹³C NMR, to characterise changes in the biochemical composition of modern einkorn grains with heating at 230 °C for 2 h, 4 h, 8 h and 24 h, encompassing conditions that replicate their undistorted ancient counterparts. The biochemical composition of archaeobotanical charred einkorn grains was also investigated by FT-IR and solid state ¹³C NMR in order to assess the changes in composition which occur during burial. Results of FT-IR and solid-state ¹³C NMR show that heating of modern einkorn grains resulted in Maillard reactions between cereal proteins and starch, forming high molecular weight melanoidins, which contain both alkyl and aromatic carbon. Loss of low molecular weight carbon and nitrogen-containing volatiles resulted in a slight but non-systematic increase in the δ¹³C values and a systematic increase of 0.8‰ in the δ¹⁵N values of the charred einkorn grains. Solid-state ¹³C NMR shows that the ancient charred einkorn grains consisted entirely of aromatic carbon and retained a similar proportion of nitrogen to their modern 24 h charred counterparts, despite a significantly lower concentration of amino acids. This indicates that the amino acid nitrogen in the ancient charred grains was retained in the stable melanoidins whose polymeric structure makes them resistant to subsequent degradation.     

Introducing δSr analysis in archaeology: a demonstration of the utility of strontium isotope fractionation in paleodietary studies

Isotopic methods are widely used in archaeology to investigate paleodiet. Here, we present a new method to identify trophic level in archaeological human populations and to investigate paleodiet. We demonstrate that strontium isotope compositions (reported as δ^88/86Sr) vary in a mass-dependent manner with increasing trophic level and can elucidate paleodiet in archaeological human populations. We present new mass-dependent strontium isotope data from tooth enamel and bone from individuals buried during the Late Intermediate Period (c. AD 1000–1300) in the large cemeteries of Chiribaya Alta, Chiribaya Baja, San Gerónimo, and El Yaral in the Ilo and Moquegua Valleys of southern Peru. We compare these data to radiogenic strontium isotope data (⁸⁷Sr/⁸⁶Sr) and light stable isotope data (δ¹⁵N_col and δ¹³C_col) from the same individuals to investigate geologic variability in strontium sources as well as marine food consumption among the Chiribaya. Our results demonstrate the utility of measurements of strontium isotope fractionation as a new tool for archaeological investigation of paleodiet. Importantly, this new technique can be used to generate paleodietary (δ^88/86Sr) and paleomobility (⁸⁷Sr/⁸⁶Sr) data from the same specimen, minimizing destructive analyses of invaluable archaeological material, and provides a new way to examine paleodiet through hydroxyapatite, which is particularly important when collagen is poorly preserved.     

A comparison of the treatment of errors in radiocarbon dating calibration methods

The application of radiocarbon dating to archaeological samples generally requires calibration of ¹⁴C dates to calendar ages and interpretation of dating errors. In this paper, four recent methods of age calibration are assessed, particularly with regard to their quality of error treatment. Recent experimental research has suggested that commonly quoted errors on “raw” ¹⁴C dates may require enlargement to more realistic levels, which, when incorporated in the calibration schemes, produce a considerable increase in the size of the typical calibrated interval. A general decrease in the sensitivity of ¹⁴C dating using single, “normal precision” dates is implied. Thus typical calibrated age intervals range from 300 to 1300 years (approximate 95% confidence level), with little improvement resulting if “high precision” calibration systems are used to correct “normal precision” dates. Of the four methods considered here, that proposed by Neftel is found to provide the most objective, flexible, comprehensive and “easy to use” scheme. This method is particularly recommended for its treatment of errors both on the dates to be calibrated and on the calibration curve itself.