After the end of World War II glaciology entered a new golden age, which has yet to end. The quality of this golden age is comparable to the classic period of the nineteenth century. The International Glaciological Society (IGS) has been the major catalyst, through its very active and co-operative international membership and its Journal of Glaciology, in setting the modern major advances in the science of glacier and ice phenomena in motion and sustaining them. The precursor of this surge in glaciological knowledge was the research, just before World War II, of the founder of the Society, Gerald Seligman, and his associates Reference Seligman(Seligman, 1941). Much credit must go to the leaders of the British Glaciological Society for the foresight that led them to change the British Glaciological Society (BGS) into the international organization in which the science of glaciology has made its major advances. (The history of the International Glaciological Society has recently been told by Reference WoodPeter Wood (1986).)

I believe it is unique in the history of scientific societies for a national society to become transformed into an international society. This is what happened to the British Glaciological Society (whose original name was the Association for the Study of Snow and Ice), which is now the International Glaciological Society and whose fiftieth anniversary we are now celebrating. The BGS actually had been working so well in the interests of international glaciology that perhaps it seemed unwise to go against the folk wisdom “if it ain't broke, don't fix it” by changing into an international society. (The membership of the IGS from its beginning was drawn from many countries besides the United Kingdom. One need only examine the list of new members in old issues of the Journal of Glaciology and of Ice to see the largely international flavor of the membership.) The international glaciological community will forever be indebted to the leaders of the British Glaciological Society. They actually encouraged this metamorphism of their organization.

The early issues of the Journal of Glaciology and of Ice give some of the reasons why this transformation came about. In the Foreword to the first issue of the Journal of Glaciology, Reference AhlmannHans Ahlmann (1947), a Swede, stated that “The British Glaciological Society is,the only society in the world which safeguards our knowledge of snow, ice and glaciers … ”. (This was stated at a time, just after World War II, when the Zeitschrift fur Gletscherkunde had ceased publication.) The Editorial Committee (1947) pointed out immediately after the Foreword that “the demand for an international journal devoted entirely to glaciology has become greater than ever. In the absence of such a journal the hope was expressed in this country, in the United States and on the Continent that this Society should take the initiative in bringing one into being.” It is clear that at a very early period in the history of the IGS its leaders were quite visionary in their plans for advancing glaciology.

The major impact of the IGS probably came from the impact of its Journal of Glaciology on the worldwide glaciological community. If a new researcher reads (and understands!) only the papers published in the Journal of Glaciology, from its early issues to the present, that researcher will have a reasonably complete understanding of the field of glaciology and of the experimental, theoretical, and field work that led to our present knowledge. Moreover, the researcher will know what the state of glaciology was at any period from the middle of the 1940s to the present.

The earliest issues of the Journal set the stage for the post-war glaciological outburst. Important results of the prewar and post-war Seligman research projects at the Jungfraujoch in Switzerland are set forth. For example, Max Perutz, who was later to win a Nobel prize in a different area of science, presented the direct evidence obtained from a bore hole in Jungfraugletscher of the differential flow motion produced by the creep of ice within a glacier Reference Perutz(Perutz, 1950). He even published a creep curve of ice based on the differential motion revealed by the change of inclination of the bore hole Reference Perutz(Perutz, 1950). The differential flow observations laid to rest Rudolf Streiff-Becker's extrusion-flow model of glacier flow Reference Seligman(Seligman, 1947; Reference Streiff-BeckerStreiff-Becker, 1953). (Extrusion flow of ice in a glacier was imagined to occur in a manner similar to squeezing toothpaste out of a tube. The usual objection raised to extrusion flow, that it is physically impossible, actually is not a valid one. Something like extrusion flow must occur near the edges of floating ice shelves when the upper ice layers are much colder than the bottom ice layers. The upper ice layers, because of their colder temperature, are, like a toothpaste tube, more difficult to deform plastically.) Perutz also described the famous wartime iceberg aircraftcarrier project which, although never carried to completion, brought home the importance of the rheological properties of ice for understanding glacier flow Reference Perutz(Perutz, 1948).

The early issues of the Journal of Glaciology saw accounts of glaciological research carried out in various parts of the world by numerous glaciologists from the international community. Many well-established glaciologists of the pre-war generation found it desirable to publish in the Journal. The German glaciologist, Richard Finsterwalder, for example, gave an account of his work on Jostedalsbreen in Norway (Reference FinsterwalderFinsterwalder, 1951). Swiss glaciological research was described by Robert Haefeli, a Swiss glaciologist (Reference HaefeliHaefeli, 1948), including his own research results on the creep closure of a tunnel dug into the ice at Jungfraujoch (Reference HaefeliHaefeli, 1952). Another Swiss, Andre Renaud, discussed work on ice grains in glacier ice. He showed that each grain is surrounded with a saline film Reference Renaud(Renaud, 1949). An Icelander, Jon Eythorsson, described the variation of the sizes of Icelandic glaciers (Reference EythôrssonEythôrsson, 1949). Another Icelander, Reference ThorarinssonSigurdur Thorarinsson (1953), also published on the glacier water outbursts of Grimsvotn. Douglas Mason, an Englishman, presented results of British work on the Larsen Ice Shelf in Antarctica (Reference MasonMason, 1950). The advance and retreat of New Zealand glaciers were correlated with precipitation records by Reference SuggateSuggate (1950). Robert Sharp, an American, gave a nice review and descriptions of valley glaciers as well as a detailed account of some of the work on Upper Seward Glacier in the Yukon, Canada (Reference SharpSharp, 1948, Reference Sharp1951). Henri Bader, the Swiss/American glaciologist, presented the first paper that led to the present extensive study of the gases in air bubbles trapped in glacier ice (Reference BaderBader, 1950). Vincent Schaefer, the General Electric Co. scientist of cloud-seeding fame, presented the new replica technique of studying ice crystals Reference Schaefer(Schaefer, 1950), work he did at Weissfluhjoch in Switzerland. The Journal had short articles with the splendid drawings that illustrated glacial phenomena of the Swiss, Reference Streiff-BeckerStreiff-Becker (1951). The renowned Japanese snow scientist, Ukichiro Nakaya, gave his account of an electron-microscope study of snow-crystal nuclei which showed that each snow crystal always has one solid nucleus (Reference NakayaNakaya, 1951). He later showed that even the snowflakes that fall out of the clean skies over Hawaii require solid nuclei for their formation (Reference NakayaNakaya, 1959). The Russian, Reference ShumskiyPetr Shumskiy (1957), gave an account of Russian post-war activities in Antarctica. And so on.

One of the early issues of the Journal carried an account of the joint meeting of the IGS with the British Rheological Club and the Institute of Metals at which Egon Orowan, one of the originators of the crystal dislocation, presented the now well-known theoretical profile of an ice cap or ice sheet found from the assumption that ice can be considered to approximate a perfectly plastic solid. There, Perutz discussed his field observation of creep flow of glacier ice (British Glaciological Society, 1949). The discussion of plastic flow was continued by Finsterwalder in a later paper published in the Journal (Reference FinsterwalderFinsterwalder, 1950). This joint meeting, which considered both the high-temperature plastic behavior of ice and the plastic flow of glaciers, actually was the first step that led to a very long series of papers in the Journal of Glaciology and other journals by many investigators from many lands on experiments on the creep of ice and about theories of the flow by creep of glaciers and ice sheets. The name that immediately comes to mind on the former topic is that of John Glen, and on the latter topic is that of John Nye, both British physicists/glaciologists. Although the longer accounts of the Glen and the Nye early work appeared in journals other than the Journal of Glaciology, their initial reports were in the Journal.

Reference GlenGlen (1952) carried out the first really comprehensive set of experiments on the high-temperature creep of ice. His experimentally determined creep law for ice (the same law is found in metals and other crystalline materials) has been used ever since in glacier-flow theories. Others from around the world, starting with the Swiss scientist Samuel Reference SteinemannSteinemann (1954), have further advanced our knowledge of the creep of ice. The first experiments on the effect of hydrostatic pressure on the creep of ice were reported by Reference RigsbyGeorge Rigsby (1958). Today, this subject has turned exotic. It is actually possible to prove experimentally, as was done by the Japanese scientist Hitoshi Shoji and the American scientist Chester Langway, that the ice deposited during the last ice age (the Wisconsin) of the Pleistocene actually is appreciably plastically softer than the more recent Holocene ice (Reference Shoji, Langway, Langway, Langway, Oeschger and DansgaardShoji and Langway, 1985). This result, as the Danish glaciologist Niels Reference ReehReeh (1985) has pointed out, may play an important part in how ice ages come and go. Reference NyeNye (1952[a], Reference Nye[b]), as all but perhaps the most recent members of the IGS know, started, developed, and solved the major fraction of the theoretical solutions of problems of glacier flow, including the flow of ice sheets and ice caps. The subsequent history of the theory of the flow of glaciers, ice sheets, and ice shelves, which has been developed extensively by many glaciologists around the world, has been well described in the texts of the IGS members Reference PatersonStan Paterson (1969, Reference Paterson1981), a Canadian; Reference LliboutryLouis Lliboutry (1964-65), a Frenchman; Reference ShumskiyPetr Shumskiy (1955), a Russian; Reference SharpSharp (1953, Reference Sharp1954); and Reference DrewryDavid Drewry (1986), an Englishman.

The Journal of Glaciology saw the early publication on topics that continue to remain of active interest to the present time. The Frenchman, Reference BauerAlbert Bauer (1955) made perhaps the first estimate of the mass balance of the Greenland ice sheet. Reference MellorMalcolm Mellor (1959), an Australian/American, made a similar early estimate for a part of Antarctica. The first rational theoretical estimate of what should be the depth of crevasses also appeared in the Journal (Reference NyeNye, 1955). The Journal contains the early (as well as later) papers by many IGS members who made significant contributions in some speciality in glaciology. For example, Wilford Weeks with Donald Anderson, both Americans, published work on sea ice (Reference Weeks and AndersonWeeks and Anderson, 1958). Another sea-ice expert, the Austrian/American, Norbert Untersteiner published early in the Journal, although his first papers were not on sea ice (Reference UntersteinerUntersteiner, 1955). The Australian/Briton, Reference RobinGordon Robin (1955) gave the first reasonably complete theoretical treatment of the temperature distribution in glaciers and ice sheets. The American, Harry Reference WexlerWexler (1960) analyzed the heating and melting of the Ross Ice Shelf. The problem of heat balance of Alpine glaciers was attacked by the Austrian scientist, Reference HoinkesHerfried Hoinkes (1955). The Australians William Budd, Richard Jenssen, and Uwe Radok developed the first numerical modeling computer calculations of ice-sheet flow and heat fluxes within them (Reference Jenssen and RadokJenssen and Radok, 1963). The Swiss avalanche expert, Reference RochAndre Roch (1954), and the American avalanche expert, Reference LaChapelleEdward LaChapelle (1960), contributed to the Journal. And so it goes.

Results of two seminal post-war scientific expeditions, one in the Arctic and one in the Antarctic, were reported in early issues of the Journal. The preliminary glaciological and seismic results of the international Norwegian-British- Swedish Antarctic Expedition (1949-52), were described by the Swede, Reference SchyttValter Schytt (1953) and by Reference RobinGordon Robin (1953). Detailed accounts of the results of the Arctic Institute of North America expeditions to Baffin Island of 1950 and 1953, whose personnel included Canadian, British, Swiss, and Norwegian scientists, were given in articles by Reference BairdPatrick Baird (1952), Reference OrvigSvenn Orvig (1953), Reference RöthlisbergerHans Röthlisberger (1955), Reference WardWilliam Ward (1952[a], Reference Ward[b], Reference Ward and Baird1954, Reference Ward1955), and Reference Ward and BairdWard and Baird (1954). On a much smaller scale, the Vaughan Lewis-led British study of Norwegian cirque glaciers set an extremely high standard on how field studies of glaciers should be carried out (Reference LewisLewis, 1960; Reference McCallMcCall, 1952).

The researches of the Norwegian-British-Swedish Antarctic Expedition and the Baffin Island expeditions are notable because they were strongly influenced by (and in turn strongly influenced) the emerging post-war theoretical glaciology. The framework of subsequent glaciological work in the Antarctic and in Greenland was largely set by the example of the polar researches of these well-known members of the IGS. For example, the very successful seismic ice-sounding studies of the Antarctic, which were begun by the Norwegian-British Swedish Antarctic Expedition, and carried further by the American scientist Albert Crary during the IGY, culminated in the discovery by the Americans, Charles Bentley, Crary, and others that a major fraction of the base of the West Antarctic ice sheet is situated well below sea-level. (The base is so far below sea-level that if the ice sheet were removed and rebound took place it would still be below sea-level.) Because the base is below sea-level, this ice sheet may be unstable. The stability question of the West Antarctic ice sheet has received a great deal of theoretical attention, principally from Terence Hughes of the University of Maine, in recent years. The stability question has been the partial justification of recent Antarctic field work. Reference ShumskiyShumskiy (1959), interestingly, raised the question of whether Antarctica is a continent or an archipelago in one of the issues of the Journal of Glaciology.

Early issues of the Journal of Glaciology contain initial reports of other research areas that were later to dominate the attention of the glaciological world. One glamorous area of glaciological research is the deep ice-core drilling programs of present and recent times. Very exciting results have and are being obtained about Holocene and Pleistocene climates. A short note in the Journal by Reference LewisChester Langway (1958), who is one of the founding fathers of ice-core deep drilling, on a 400 m deep ice core obtained in Greenland was, in retrospect, the announcement that a new and qualitatively different glaciological research area had come into being. The Dane, Willy Dansgaard, the Swiss, Hans Oeschger, and the Frenchman, Claude Lorius, in particular, have had immense success in extracting very intriguing climatic information from the deep ice cores. Remote sensing, including radar sounding of ice thickness, is another area that has grown along with the Journal (see Reference ZwallyJay Zwally's (1987) paper in this volume).

Symposia organized by the IGS on special glaciological topics have played a strong role in the development of glaciology. Early conferences received brief write-ups in the Journal (Reference Jenssen and RadokBritish Glaciological Society, 1949; Symposium 1951 [a], [b]). Later ones, such as the 1977 one on the physics and chemistry of ice (Symposium, 1978) and the 1974 one on remote sensing (Symposium, 1975), required thick volumes of the Journal for their contents. Eventually, both the proceedings of IGS-organized symposia, and the proceedings of glaciological symposia organized by other bodies, were published in a new journal of the Society, Annals of Glaciology. These conferences and conference proceedings enable glaciologists from around the world to present for some speciality a very useful state-of-the-art record, summaries of past accomplishments, significant new results, and, perhaps most important of all, new directions for the field. The 1978 Ottawa glacier-bed symposium, organized by the National Research Council of Canada and published in the Journal (Symposium, 1979), is a prime example of pushing a field on to a new path. The topic of that glacier-bed symposium was the glacier-bed ice—rock interface. But a paper presented at Ottawa by Geoffrey Reference BoultonBoulton (1979), now at the University of Edinburgh, was concerned with glacier ice moving over a deformable bed. And at the present time the deformable glacier-bed problem is one of the most interesting areas in glacier mechanics. This problem was a strong focus in the recent Whistler Village, British Columbia, Canada, conference on fast glacier flow sponsored by the American Geophysical Union, and the Interlaken, Switzerland, conference on basal water pressure sponsored by the EidgenSssiche Technische Hochschule (ETH) of Zurich (both conferences were organized primarily by members of the IGS). The University of Wisconsin results from Ice Stream B, which partly drains the West Antarctic ice sheet, show that this ice stream moves over a deformable bed (Reference Alley, Alley, Blankenship, Bentley and RooneyAlley and others, 1986; Reference BauerBlankenship and others, 1986); (Since these Ice Stream B results were obtained with seismic techniques, they might be regarded as a late return of a signal sent by the Norwegian-British-Swedish Antarctic Expedition mentioned earlier in this paper.)