EVOLUTION OF AVIAN TEMPERATURE REGULATION 



64. Odum, E. P. 1942. Muscle tremors and the development of tem- 



perature regulation in birds. Am. J. Physiol. 136:618-622, 



65. Olson, E. C. 1959. The evolution of mammalian characters. 



Evolution 13:344-353. 



66. Pearson, O. P. 1954. Habits of the lizard. Liolaemus multi - 



formis multiformis , at high altitudes in southern Peru. 

 Copeia, p. 111-116. 



67. Pembrey, M. S. 1895. The effect of variations in external tem- 



perature upon the output of carbonic acid and the temperature 

 of young animals. J. Physiol. 18:363-379. 



68. Rand ell, W. C. 1943. Factors influencing the temperature regu- 



lation of birds. Am. J. Physiol. 139:56-63. 



69. Rodbard, S. 1948. Body temperature, blood pressure, and hypo- 



thalamus. Science 108:413-415. 



70. Rogers, F. T. 1928. Studies on the brain stem. XI. The effects 



of artificial stimulation and of traumatism on the avian thala- 

 mus. Am. J. Physiol. 86:639-650. 



71. Rogers, F. T., and R. W. Lackey. 1923. Studies on the brain 



stem VII. The respiratory exchange and heat production after 

 destruction of the body temperatiire-regulating centers of the 

 hjTJOthalamus. Am. J. Physiol. 66:453-460. 



72. Saafeld, E. von. 1936. Untersuchungen uber das Hacheln bei 



Tauben. Zeit. vergl. Physiol. 23:727-743. 



73. Saint-Girons, H., and M. C. Saint-Girons.TF56. Cycle d'acti- 



vite et thermoregulation chez les reptiles (lezards et ser- 

 pents). Vie et milieu 7:133-226. 



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