INDEX 



293 



origin, 23-25 

 Viviparity, in fishes, 250 

 Vision, in primates, 177 f. 



Walker, A. M., 47 

 Water 



active transport, 144, 266, 



267 

 balance in Amphibia, 95, 

 98 f., 100 f. 

 in bony fishes, 104 f . 

 in elasmobranchs, 61 

 in mammals, 162-65 

 in Mesozoic reptiles, 



129-30 

 in reptiles and birds. 



123 f., 125, 165-74 

 balance principles in Am- 

 phibia, 257 

 conservation, 33 



in birds, 165-72 

 excretion, 35, 44, 45 

 of oxidation of food, 147- 



48 

 osmotically free, 44 

 storage, in peritoneal cav- 

 ity, etc., 100 

 Watson, D. M. S., 92 

 Weber's Sonata No. 1, Op. 



24, 208 

 Whales, 162 

 White Mountains, 86 

 Whitehead, A. N., 223 



