148 



INDEX 



Corviis hrachyhrynchos, 100. 

 Cowbird, 76. 



Cretaceous, 65, 67, 68, 103. 

 Crow, 63, 96, 112, 129, 132-139. 

 Cycles of animal abundance, 

 60-64. 



Day-length, 54, 72, 115 et seq. 



Diabetes, 38. 



Dipper, 23. 



Direction, sense of, 80-85. 



Ductless glands, 37-44, 139. 



Ear, 29, 30, 31, 32-34. 

 Edmonton, (Alberta), 50, 53, 54, 



55, 57, 59, 111, 133-139. 



, meteorological statistics, 54. 



Eel, 47, 79. 



Endocrine organs, see ductless 



glands. 

 Endolymph, 32. 

 Environment, 41-85. 

 Eocene, 67, 68, 73. 

 Equilibration, see balance. 

 Ergosterol, 58. 

 Experiments with crows, 132-139. 



juncos, 118-132. 



Eye, 34^36. 



Feathers, 10, 11. 



Feeding movements, see move- 

 ments, feeding. 

 Fibre, see nerves. 

 Fish, 9, 17, 18, 46, 47, 48, 49, 79. 

 Flight, 9. 



Follicle, ovarian, 41. 



Food problem in winter, 55, 56, 



114. 

 Fossil birds, 64, 65, 66, 67. 



pollen grains, 69. 



Fovea, 35, 36, 81. 

 Franklin gull, 77. 

 Frog, 19. 

 Furnarius cunicularius, 24. 



Gadow, Hans, 46. 



Gannet, 28. 



Geocarcinas, 47, 78. 



Geological epochs, methods of 



estimating, 67. 

 Germinal epithelium, 41. 

 Gonads, 38-^4. 

 , internal secretions of, 42- 



44, 117. 

 Gonad changes and behavior, 



130, 131. 

 in relation to forced 



exercise, 124, 125. 

 light, 



122, 123. 

 tem- 

 peratures, 121, 122. 

 Golden plover, American, 75, 77, 



85, 107, 112. 



, Pacific, 107, 108. 



Greenland, 68, 88. 



Hawks, 29, 36, 59, 62. 



Heat, conservation of, 7 et seq. 



Hesperornis, 65. 



