Technology and ocean‐scape: Defining the deep sea in mid‐nineteenth century

The ocean's profound inaccessibility makes it impossible to comprehend except through the mediation of technology. The first investigators to explore the great depths were hydrographers whose work was animated by mid‐nineteenth century growth of political, economic, and cultural interest in the oceans. While submarine telegraphy certainly boosted ocean science, interest in this field derived first from commercial concerns related to whaling and shipping as well as the intellectual pursuits of physical geography and questions about the existence of life at great depths. Hydrographers’ developing conception of the oceanic environment never represented a clear translation from technology. Dramatic changes in the understanding of the shape of the deep‐sea floor testified to the complexity of interaction between sounding machines, methods, and interpretations of depth. The shifting image of the sea floor not only reflected increasingly accurate measurements, but also mirrored shifting human motivations for studying this unexplored territory.     

‘Wanderer,kommst du nach Pforta …’: the tension between Classical tradition and the demands of a Nazi elite-school education at Schulpforta and Ilfeld, 1934–45

This paper explores the tensions which arose when Schulpforta, Germany's leading humanistic boarding school, was forcibly turned into a Nazi elite school (a Nationalpolitische Erziehungsanstalt, or Napola). The time-honoured traditions of Christianity and enlightened humanism previously cultivated at the erstwhile Landesschule zur Pforta (alma mater of Fichte, Ranke and Nietzsche) were swiftly subordinated to the demands of National Socialist ideology. Schulpforta, a former monastic foundation, was radically dechristianised, and the school's Classical curriculum soon served only to emphasise those aspects of Greco-Roman Antiquity which could ‘help the Third Reich achieve its destiny’, portraying the Greeks and Romans as proto-National Socialists, pure Aryan ancestors of the modern German race. The Napola curriculum focused on sport and pre-military training over academic excellence, and contemporary documentary evidence, memoirs and newly obtained eyewitness testimony all suggest that the Napola administration wished to assimilate Pforta with any other Napola. This idea is borne out by comparing the case of Napola Ilfeld, a former Klosterschule (monastery school) with a similar history. By the mid-1940s, Ilfeld had lost almost all connection with its humanistic past. Ultimately, we can see the erosion and Nazification of these schools' Christian and humanistic traditions as exemplifying in microcosm tendencies which were prevalent throughout the Third Reich.     

Editorial

For John Stuart Mill, Matthew Arnold, and their later Victorian respondents, the Stoic writer and second-century CE Roman emperor Marcus Aurelius represented a test-case for the sufficiency of the ostensibly masculine practices of askesis and detachment as ethical ideals, specifically in the context of Christianity. A brief passage in Mill's On Liberty (1859) comparing Stoic ethics with Christian ethical practice provoked an extended response from Arnold in an 1863 review essay. Mill and Arnold both used comparisons with Christianity to trace the contours and to explore the limits of Marcus Aurelius's ‘lovable’ nature; in doing so, Arnold in particular enacted a peculiar kind of historical sympathy for both the Marcus Aurelius that was and for a missed rapprochement between classical and Christian ethics. For a series of later writers, including freethinkers, religious conservatives and liberal Christians, Marcus Aurelius either promised or threatened to reconcile Stoicism with Christianity. Assessing the emperor in the light of Christianity became a means both for producing or denying a link to the classical past and for describing the condition of Christianity in England. A key point of contention for these writers and a landmark in the broader debate over Victorian secularization was the question of Marcus Aurelius' role in the torture and killing of 48 Christians at Lugdunum (Lyons) in 177 CE.     

Invasion of a karst aquifer by hydrothermal fluids: evidence from stable isotopic compositions of cave mineralization

Mineral deposits in the Cupp‐Coutunn/Promeszutochnaya cave system (Turkmenia, central Asia) record a phase of hydrothermal activity within a pre‐existing karstic groundwater conduit system. Hydrothermal fluids entered the caves through fault zones and deposited sulphate, sulphide and carbonate minerals under phreatic conditions. Locally, intense alteration of limestone wall rocks also occurred at this stage. Elsewhere in the region, similar faults contain economic quantities of galena and elemental sulphur mineralization. Comparisons between the Pb and S isotope compositions of minerals found in cave and ore deposits confirm the link between economic mineralization and hydrothermal activity at Cupp‐Coutunn. The predominance of sulphate mineralization in Cupp‐Coutunn implies that the fluids were more oxidized in the higher permeability zone associated with the karst aquifer. A slight increase in the δ³⁴S of sulphate minerals and a corresponding δ³⁴S decrease in sulphides suggest that partial isotopic equilibration occurred during oxidation. Carbonate minerals indicate that the hydrothermal fluid was enriched in ¹⁸O (δ¹⁸O_SMOW ～ + 10‰) relative to meteoric groundwater and seawater. Estimated values for δ¹³C_DIC (δ¹³C_PDB ～ ? 13‰) are consistent with compositions expected for dissolved inorganic carbon (DIC) derived from the products of thermal decomposition of organic matter and dissolution of marine carbonate. Values derived for δ¹³C_DIC and δ¹⁸O_water indicate that the hydrothermal fluid was of basinal brine origin, generated by extensive water–rock interaction. Following the hydrothermal phase, speleothemic minerals were precipitated under vadose conditions. Speleothemic sulphates show a bimodal sulphur isotope distribution. One group has compositions similar to the hydrothermal sulphates, whilst the second group is characterized by higher δ³⁴S values. This latter group may either record the effects of microbial sulphate reduction, or reflect the introduction of sulphate‐rich groundwater generated by the dissolution of overlying evaporites. Oxygen isotope compositions show that calcite speleothems were precipitated from nonthermal groundwater of meteoric origin. Carbonate speleothems are relatively enriched in ¹³C compared to most cave deposits, but can be explained by normal speleothem‐forming processes under thin, arid‐zone soils dominated by C4 vegetation. However, the presence of sulphate speleothems, with isotopic compositions indicative of the oxidation of hydrothermal sulphide, implies that CO₂ derived by reaction of limestone with sulphuric acid (‘condensation corrosion’) contributed to the formation of ¹³C‐enriched speleothem deposits.