INDEX 



A 



Acclimatization 25 



Adaptation to land life 15 



Adjustment 51, 77, 94 



Age 38, 76, 77, 80 



Air sacs of birds 12 



Ants 85, 88 



Arboreal life 12 



Atmosphere 5 



B 



Bank swallow 12 



Behavior 84 



Birds 3, 11 



Blood 3, 51, 90, 96, 99 



Body temperature 50, 55, 79 



constancy 34, 79 



fluctuations 55, 79, 80, 86 



of homoiotherms 30 



of poikilotherms 20, 28 



regulation of 32, 56 



Brain, evolution of 12 



C 



Carbon-dioxide 



in relation to climate 7 



in relation to respiration 42 



Chlorophyll 9 



Climate 6, 97 



Clothing 35, 96 



Coelenterata ., 23 



Color 23 



Conduction 19 



Conservation of energy 9 



Constancy of body temperature 34, 89 



Cooling mechanisms 54 



Cynodontia 13 



115 



