WISE Y Wp lt Fig. 5. Total radioactive fallout from the Bravo cloud in the period from 2 to 35 days after detonation, in millicuries per 100 square miles. Hatching indicates approximate March position of the Intertropical Convergence Zone, the belt of low pressure that tends to separate Northern and Southern Hemisphere air near the surface of the earth. tained at the Southern Hemisphere stations especially during the Mike shot, are immediately evident from the fallout maps. The northern part of the Northern Hemisphere, however, received equally small depositions. The distribution of fallout for the Pacific stations appears to be consistent with the features of the meteorology described, although the branching of the cloud south of Japan in the Mike pattern is based only on scanty observational evidence. It is apparent that radioactive debris produced by nuclear explosions does not possess all the desired attributes of a tracer for studying global circulations. Information concerning the magnitude and distribution of the radioactivity that remains airborneafter theinitial fallout is not available. The debris, being par- ticulate, is washed out of the atmosphere and cannotbestrictly treated as a con- servative property. Thus, for example, the depositions in the Southern Hemis- phere may have been low because most of the debris was rained out as it passed southward through the Intertropical Convergence Zone. In addition, the most effective sampling program for the debris provides only the crudest measure of the fallout. Yet, despite these limitations, it appears that the meteorologist can ob- A. O. Weese, Ecologist tain useful information by operating such a network of gummed films during nuclear test periods. Although it is not proposed that special nuclear tests be undertaken for meteorological purposes, it seems reasonable to expect even greater value from future tests using an expanded network and having detonations at other locations and times. References 1. 2, 3. 4. R. R. Braham, B. K. Seely, W. D. Crozier, Trans. Am. Geophys. Union 33, 825 (1952). R. J. List, Bull, Am. Meteorol. Soe. 35, 315 (1954). H. Wexler, Weatherwise 3, 129 (1950). M. Eisenbud and J. H. Harley, Science 124, 251 (1956). the communities to which they belonged. The summers for him were always a time for study, and he took part in the work of various summerlaboratories. He was in charge of the course in marine ecology at the Friday Harbor Laboratory in Puget Sound in 1925 and 1929. He and I were among the founders of the Rocky Mountain Biological Laboratory at Gothic, near Crested Butte, Colorado,in Asa Orrin Weese was born of Canadian parentage in Hutchinson, Minnesota, 7 November 1885, and died in Norman, Oklahoma, 20 November 1955, After graduating from the University of Minnesota in 1909, he taught for 2 years in an academy and, from 1911 to 1922, was a member of the departmentof biology at the University of New Mexico. He received the degrees of master of arts (1914) and doctor of philosophy (1922) at the University of Illinois, working in ecology under V. E. Shelford. His special interest in community ecology and suc14 SEPTEMBER 1956 cession began then and continued throughouthis entire career. He was professor of biology at James Millikan University for 2 years and then came in 1924 to the University of Oklahoma as a pro- fessor of zoology. As a studentof developing biotic communities, Weese was, of course, interested in all of their components, both plant and animal, but his personal studics turned especially to the insects of the grasslands. In New Mexico he studied also the horned lizard and, at the seashore, annelids and sea urchins, all in relation to 1928, and he succeededto its presidency in 1938. For many years he was responsible for the instruction in ecology at that laboratory. Hewasthe secretary of the Ecological Society for 10 years and its president in 1931. He served officially in various other organizations, including the Ecologist’s Union, the National Research Council’s Committee on Grasslands, Grasslands Research Foundation, and the Oklahoma Biological Survey. Inall of these he held important offices and helped shape policies. He plaved a significant part in the activities of the Oklahoma Academyof 477