The north coast of Ellesmere Island is the location of the only known ice shelves in the northern hemisphere. Present Arctic ice shelves are as much as 40–50 m thick and occupy sheltered fiords and embayments. These thick floating ice masses are remnants of the once-extensive Ellesmere Ice Shelf that has disintegrated since 1876–1906, when Aldrich and Peary respectively travelled along the coast. Reasons for the disintegration are not clear, but it has created many ice islands that have been known to circulate in the Arctic Ocean for 35 years or more. Both ice islands and ice shelves are readily distinguished from their surroundings by an undulating surface topography of parallel ridges and troughs up to 300 m apart. The undulations probably owe their origin to the effects of wind and meltwater. Since 1952 these large ice masses have been the subject of considerable research. Ice shelf growth began about 4000 BP, when glaciers flowed off the land and remained afloat in fiords and inlets, and sea ice grew thick and remained fast to the coast. The glacier and sea ice acted as platforms for further thickening both by surface accumulation of snow and ice and by undersurface accretion of fresh, brackish and saline ice. Although much has been learned about the growth, structure and behaviour of arctic ice shelves, questions still remain concerning ice island calving mechanisms, bottom freezing, thick sea ice growth and origins of the ridges and troughs.

An index of human ‘survival time outdoors in extreme cold’ (STOEC) has been developed, using body-atmosphere energy budget modelling procedures. The index, which is applicable in places like Antarctica where only limited climatological data are available, is based on the calculated rate of fall of core temperature from 37°C to 27°C of a standard inactive healthy subject in full polar clothing.

Applied to data from 12 Antarctic stations it indicates relative severity of their mean and extreme climatic conditions. The severest winter conditions become lifethreatening after only about 20 minutes. At most stations in winter, exposure outdoors for more than two hours would be dangerous. Conditions at all coastal stations in summer are mildenough to allow a normal core temperature to be maintained. The index has many applications, for example estimating likely survival times of immobilized accident victims and guidelines for duration of work periods outside.

In Canada's Northwest Territories native peoples constitute the majority of the population, a unique situation which has recently had significant repercussions, national as well as regional, and will continue to do so in the foreseeable future. Native peoples are already playing an increasingly important role politically and economically in the Territories, currently illustrated by a proposed restructuring of the northern political map of Canada. Resolution of Comprehensive Land Claims with the Government of Canada will provide them with a major role in resource development and in policy governing it. At the time that many native peoples are entering into more active participation in modern society, renewed interest that others are showing in aspects of traditional culture creates at least a potential source of friction among them.

Development during approximately 200 years of agricultural activity in Alaska has been varied and generally inadequate. Four stages are here identified. During the period from Russian and early American colonization to the late 1880s production was largely for personal consumption. From 1898 to World War II federal intervention stimulated local commercial agriculture, and from the late 1940s to the late 1960s commercial production expanded. Since then a state- supported strategy to develop an export-based agriculture has been tried, but implementation has not been completed. Alaska remains a frontier which has yet to find a workable manner in which to implement a strategy for its agriculture.

In November 1986 the United Nations considered again the ‘Question of Antarctica’ and published a further study, up-dating and developing that produced in 1984 and guiding UN First Committee discussions of 18–19 November 1986. Three resolutions were adopted concerning availability of information to the UN on Antarctica, a moratorium on the Antarctic minerals regime negotiations, and the exclusion of South Africa as a Consulative Party. Most Antarctic Treaty parties did not vote; the consensus that characterized UN debates on Antarctica in 1983 and 1984 has yet to be restored. The 1986 session suggested more questions rather than providing answers; a key question is whether the Antarctic Treaty System will preserve its unity in view of the problem of continuing South African membership.

This study breaks new ground by involving the partners of Antarctic expeditioners as well as the expeditioners themselves in one aspect of a comprehensive research programme on stress. It reports the reactions of both parties before, during and after their separation. It shows that there were discrepancies between the partners about the sufficiency of prior discussion, the possibility of injury or death arising with the expeditioners on their hazardous venture, and about the ability of partners to cope at home. A follow up of the couples sixteen months after the separation showed that their marital relationships in general had improved slightly, although there were some individual exceptions. The study emphasised the importance of including partners as well as the specific subjects themselves in future medical and behavioural research; future studies might usefully extend beyond the couples to include all relevant family members.

The 17th-century German traveller and writer Adam Olearius is best known for his account of travels in Russia and Persia, first published in 1656. Parts of this work have been translated into English under the title ‘The travels of Olearius in seventeenth-century Russia’. Among hitherto untranslated sections is the chapter ‘Von den Grünländern’, an early and well-researched account of Greenland and its inhabitants, prompted by his examination of a party of three Greenlanders in Gottorp, Schleswig, in 1656. This article is a translation of the chapter, with an introduction to Olearius and his background.