Ladislav Jansky received the P.H. degree in 1958 from Charles 

 University, Prague, £tepartment of Animal Physiology. He now holds 

 the title of Assistant Professor, Department of Comparative Phys- 

 iology, Charles University. His research interests are: metabolism 

 in the cold, cold adaptation, maximal metabolism, organ thermo- 

 genesis, and hibernation. 



J. Sanford Hart received the B.A. 1939, the M.A. 1943, the 

 Ph.D. 1949 all from Toronto, and was elected a F.R.S.C. in 1956. 

 His present title is Head, Environmental Physiology section, 

 Division of Applied Biology, NRC, Ottawa, Canada. His general 

 interest encompasses theenvironmentalphysiology of homeotherms, 

 acclimatization in mammals and birds native to cold climates 

 metabolic mechanisms of acclimation to cold in rats, shivering 

 mechanisms and organ thermogenesis, and cardiovascular res- 

 ponses to exercise and cold exposure. 



Max Kleiber obtained the D.Sci. in 1924 and the Privat Dozent 

 in 1928 from the Federal Institute of Technology, Zurich, Switzer- 

 land. He is now Professor Emeritus at the University of California 

 and has been awarded an honorary LL.D. from California in 1961. 

 His numerous contributions to physiology have been in the fields 

 of energy metabolism and feed utilization, environmental tempera- 

 ture, energy metabolism and food utilization (in chicks and cows), 

 measurement of replacement equivalents for food in animal produc- 

 tion, energy metabolism and nutritive deficiencies, intermediary 

 metabolism especially in milk formation using radiocarbon (C ) 

 as a metabolic tracer, and phosphorus and calcium metabolism 

 using P and Ca as tracers. His recent book. Fire of Life, is 

 destined to become a classic. 



George C. West received his B.A. degree from Middlebury 

 College in 1953, and his M.S. and Ph.D. in Zoology under Dr. S. C. 

 Kendeigh at the University of Illinois in 1956 and 1958 respectively. 

 He spent a year doing post-doctoral research at Illinois and a year 

 as a post-doctoral fellow of the National Research Council of 

 Canada with Dr. J. S. Hart. He is now Assistant Professor of 



IV 



