118 INDEX 



N 



Nervous control of body temperature 54, 63, 84 



Nutrition 43, 52, 89 



P 



Pigmentation 23 



Planaria 



behavior 86 



tolerance to extreme temperatures 26 



Planetesimal hypothesis 4 



Poikilotherms 



acclimatization 25 



behavior 85 



body temperature of 17, 20, 28 



energy requirements 2, 69 



growth 69 



hibernation 81 



metabolism 50 



tolerance to temperature changes 26 



Protozoa, encystment 25 



Pseudoseuchia 11 



R 



Radiation 7, 8, 22 



Eeptilia 11, 16 



Eesistance to extreme temperatures 33 



Eespiration 41, 42 



Ehythms in metabolism 49 



S 



Seed plants, evolution 15 



Sloth 31 



Solar radiation 9 



Sources of heat 7 



Spinal cord sections 64 



Spiny ant-eater 30, 82, 92 



Stability 3, 89, 93, 96 



Starvation 45 



Stenothermal animals 26 



Surface area 19, 52, 60 



