Index, 313 



PAGE 



Grouse, Ptarmigan— color and instinct united to protect it 133 



H. 



Hawk, fish, night, hen Qi. loi, 106 



Hen 158,160,176 



History ^^ 



Natural and Speculative Philosophy 30 



Homes of animals • -96-103 



Hopkins, Mark, quotations 240, 24S 



Hornets' nests ^6 



Huber 122,152 



Humboldt 299 



Tj , 76, S8 



Huxley ' ' 



I. 



Iceland, coast of ^^5 



Impulses "9 



to build 106, 107 



independent of organization I75 



Individual, sacrificed for good of species I57, 158 



Insects wonderful correlation between form, color, and instinct 



in...' ; ;•••• ^33 



Instinct, to be studied in service of man, some difficulties to 



be met ^3 



definitions of 25, 26. 40-42, 48, 136, 1S5, 227 



apparent work of, and how secured 27, 28 



bec^ins by utilizing structure and function — exam- 

 ples 28 



must be investigated as a fact 34» 35 



an absolute necessity in animal life 37 



what the scheme in this study of it, embraces 37> 38 



definitions by Paley, Whately, Hamilton. . .26, 40, ^i, 42 



alone is useless 48 



structure and function supplemented by the earth. . 



50, 51, 52 



seems to take counsel with physical forces 53, 54 



provisions in plant, like 55> 58 



hornets' nests the work of 57 



works with apparent forethought 59 



