Method-dependent variations in stable isotope results for structural carbonate in bone bioapatite

Stable carbon and oxygen isotope values (δ¹³C, δ¹⁸O) were obtained for structural carbonate in the bioapatite of archaeological bones from Guatemala and Sudan using several common analytical methods. For the Sudan samples, the different methods produced δ¹³C values within ±0.1‰ and δ¹⁸O values within ±0.7‰, on average. The isotopic results for the Guatemala samples were similar in reproducibility to the Sudan samples when obtained using methods that employed lower reaction temperatures and reactions in sealed vessels. However, many Guatemala samples had highly variable and extremely low δ¹⁸O values when reacted at higher temperatures in vessels that remained open to cryogenic traps. The latter arrangement caused reaction products to be removed immediately upon their production. The anomalously low δ¹⁸O values are related to the production of a contaminant gas that causes the m/z 46/44 ratio to be lowered, either by adding to the m/z 44 peak or subtracting from the m/z 46 peak. That said, potential contaminant materials were not detectable in “anomalous” bones using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, or inductively-coupled plasma atomic emission spectroscopy. However, subtle structural and chemical differences between “normal” and “anomalous” samples were observed, most notably in the FTIR ν₂ CO₃ domain. We suggest that these changes promote volatilization of an oxyphosphorus compound and oxygen isotope fractionation between PO⁻ derived from this compound and CO₂ derived from bone carbonate. Production of the contaminant gas and the related “anomalous” δ¹⁸O values is reversible if the reaction occurs within a sealed vessel for a sufficient period of time, which allows a “back-reaction” to occur.     

Book reviews

THE UNITED STATES IN WORLD AFFAIRS 1949. By Richard P. Stebbins and the Research Staff of the Council of Foreign Relations. New York, Harper and Brothers, 1950.

CONDITIONS OF ECONOMIC PROGRESS. By Colin Clark. 2nd Edition. London, Macmillan, 1951. xvi ‐J‐ 584 pp. 50/‐ stg.

INDIAN‐AMERICAN RELATIONS. Proceedings of the India‐America Conference held in New Delhi in December 1949. Issued under the joint auspices of the Indian Council of World Affairs and the American Institute of Pacific Relations. Oxford University Press. v + 79 pp.

THE STATE OF ASIA: A Contemporary Survey. By Lawrence K. Rosinger and Associates. Issued under the auspices of the American Institute of Pacific Relations. Alfred A. Knopf, 1951. 512 pp. Bibliography and index.

UNITED KINGDOM ADMINISTRATION AND INTERNATIONAL ORGANISATIONS: A Report by a Study Group of the Institute of Public Administration. R.I.I.A., 1951. 55 pp. 4/‐.     

Bernard Lamy,Empiricism, and Cartesianism

Bernard Lamy (1640–1715) is frequently included among the Cartesian Empiricists of the second half of the seventeenth century. He has also been described as an Augustinian who dabbled in Cartesianism. While acknowledging that there are both empiricist and Augustinian elements in his thought, I argue that it ought not be forgotten that there are central components of his philosophy that are both anti-empiricist and in opposition to Augustine. My aim in this paper, though, is not (merely) critical; I hope to show that Lamy provides us with one more example of the diversity present among the various thinkers labelled as ‘Cartesian’.     

The archaeology of World War II karst defences in the Pacific

During World War II, the Japanese military, using either their own or civilian labour, excavated tunnels into the limestone of many Pacific islands and modified natural caves for use as command posts, hospitals, combat positions, storage, and shelter. Civilians also used caves to shelter themselves during the war. This article introduces the archaeology of WWII caves and tunnels referred to collectively as ‘karst defences.’ While karst defences exist across the Pacific, little is known about these sites both historically and archaeologically. Based on a study in Saipan, Commonwealth of the Northern Mariana Islands, and analysis of karst defence construction and function, this article demonstrates that karst defence use extends beyond what has been described in historical accounts. The authors find that the sites in Saipan were used by three different groups of people and identifies distinct Japanese military and civilian sites and evidence of post-war use by the United States.     

Exploring Oyster (Crassostrea virginica) Habitat Collection via Oxygen Isotope Geochemistry and its Implications for Ritual and Mound Construction at Crystal River and Roberts Island,Florida

Research at Crystal River and Roberts Island Shell Mound Complex, on the western coast of Florida, USA, offers a quantitative assessment of the temporality of shell deposit construction, Native subsistence practices, and mobility patterns through stable oxygen isotope data from eastern oyster (C. virginica). The δ¹⁸O_water values of oysters vary synchronously with salinity, assuming relatively constant δ¹⁸O_water/salinity gradients since the time of occupation, allowing for an examination of shifts in oyster habitat exploitation over time. Our previous (Thompson et al. 2015) study indicated that midden accumulation occurred throughout the year, while oysters from mound deposits were collected in colder months. New data indicate that in addition to differential season of collection, habitat exploitation also varied. During early occupation at the site, oysters were collected primarily from lower saline habitats, while in later phases oysters were obtained from higher salinity waters; we relate this to a lower sea level and concomitant settlement shift seaward. Additionally, oyster from later mound contexts was collected from higher saline habitats relative to those in midden contexts; Native people may have targeted specific bioherms at certain times for the year for feasting-related mound construction.     

How Much Life do I Lose from the Plague? Educational Board Games as Teaching Tools in Archaeology and Ancient History Courses

This article describes the development, implementation, assessment, debriefing and outcomes, and potential uses of a university student-driven educational gaming project, as a major assessment item in an archaeology course entitled ‘Ancient Medicine’. Discussion of these various aspects of the project is explored in the context of educational gaming theory and practice. We demonstrate that educational board games not only represent an effective method for students to retain and convey information in courses exploring the history and archaeology of medicine, but provide such a platform for undergraduate courses in general. Furthermore, we argue that they can present a cost-effective, fun and less time-/resource-intensive alternative to electronic or web-based projects, while still being an attractive addition to traditional classroom teaching methods.     

From the Ground,Up: The Looting of Vưườn Chuối within the Vietnamese and Southeast Asian Antiquities Trade

The exact nature of the illicit antiquities trade from ground to market in Southeast Asia remains poorly known outside of Thailand and Cambodia, where most research has been focused. This paper helps to address this imbalance by documenting and contextualizing looting activities at the Bronze and Iron Age site of V???n Chu?i, located within urban Hanoi. A brief excavation history is provided so as to place recent looting into archaeological context. The methods used to document the recent and on-going looting observed are then discussed, followed by the nature of the current threat to V???n Chu?i and a summation of what little is known about the Vietnamese antiquities trade in general and its relationship to regional antiquities trafficking. Finally, we discuss the current regulatory landscape in terms of constitutional, ownership, penal and international law, difficulties with enforcement and prosecution, and what course of action is needed not only to protect V???n Chu?i and similar sites in and around Hanoi, but also to continue to raise public awareness of the archaeological repercussions of the trade itself.     

Winda Lingo Parugoneit1 or Why Set the Bush [On] Fire? Fire and Victorian Aboriginal People on the Colonial Frontier

There is an ethnographic and historical record that, despite its paucity, can offer specific insight into various contextual matters (purpose, motivations, acknowledgement) relating to how and why fire was being used by Victorian Aboriginal people in the nineteenth century. This insight is essential to developing cross-culturally appropriate land and fire management strategies in the present and into the future. This article demonstrates the need for further research into historical accounts of Aboriginal burning in Victoria.     

Modified Kaplan–Meier Estimator and Nelson–Aalen Estimator with Geographical Weighting for Survival Data

The Kaplan–Meier and Nelson–Aalen estimators are universally used methods in clinical studies. In a public health study, people often collect data from different locations of the medical services provider. When some studies need to consider survival curves from different locations, traditional estimators simply estimate the marginal survival curves using stratification. In this article, we use the idea from geographically weighted regression to add geographical weights to the observations to get modified versions of the Kaplan–Meier and Nelson–Aalen estimators which can represent the local survival curve and cumulative hazard. We use counting process methods to derive these modified estimators and to estimate their variances. In addition, we discuss some general spatial weighting functions which can be used in computing these estimators. Furthermore, we present simulation results to illustrate the performance of the modified estimators. Finally, we apply our method to prostate cancer data from the SEER cancer registry for the state of Louisiana.