DAWSON, W. R. 



74. Salt, G. W., and E. Zeuthen. 1960. The respiratory system, p. 



363-409. In A. J. Marshall, (ed.), Biology and comparative 

 physiology of birds. (Vol. I). Academic Press, New York. 



75. Schmidt- Nielsen, K,, and B. Schmidt- Nielsen. 1952. Water me- 



tabolism of desert mammals. Physiol. Rev. 32:135-166. 



76. Scholander, P. F. 1955. Evolution of climatic adaptationin ho- 



meotherms. Evolution 9:15-26. 



77. Scholander, P. F. 1956. Climatic rules. Evolution 10:339-340. 



78. Scholander, P. F., R. Hock, V. Walters, and L. Irving. 1950a. 



Adaptation to cold in arctic and tropical mammals and birds 

 in relation to body temperature, insulation, and basal meta- 

 bolic rate. Biol. Bull. 99:259-271. 



79. Scholander, P. F., R. Hock, V. Walters, F. Johnson, and L. 



Irving. 1950b. Heat regulation in some artic and tropical 

 mammals and birds. Biol. Bull. 99:237-258. 



80. Scholander, P. F., V. Walters, R. Hock, and L. Irving. 1950c. 



Body insulation of some arctic and tropical mammals and 

 birds. Biol. Bull. 99:225-236. 



81. Simpson , G. G. 1959. Mesozoic mammals and the polyphyletic 



origin of mammals. Evolution 13:405-414. 



82. Stebbins, R. C, and R. M. Eakin. 1958. The role of the "third 



eye" in reptilian behavior. Am. Mus. Nov., no. 1870, p. 1-40. 



83. Steen, J. 1958. Climatic adaptation in some small northern 



birds. Ecology 39:625-629. 



84. Steen, J., and P. S. Enger. 1957. Muscular heat production in 



pigeons during exposure tocold. Am. J.Physiol. 190:157-158. 



70 



