Similarity of parts in ani- 

 mals, 48, 50 



Scott, W. B., quoted, 59 



Special creation mentioned, 61, 

 62 



Social units, subjects of evolu- 

 tion, 66 



Selection, artificial different 

 from natural, 71, 72 



Special forms of artificial selec- 

 tion, 74 



Sexual selection, 82 



Spontaneous generation, 94 



Selenka's study of embryos, 103 



School education, benefits of, 

 112 



Second childhood, a profound 

 truth, 120 



Sleep, how caused, 125 



Society, forms of, 145 



Slavery, came with commodities, 

 149 



Survival, of human laws, 152 



Social evolution, illustrated by 

 ancient manuscripts, 154 

 its future, 277 



Superstition, specimens of, 161 



Subjective, The^ 188 



Shakespeare, difference between 

 his brain and the lowest 

 man, 191, 202 



Self, 206, 221, 222 



Smith, Norman Kemp, on con- 

 sciousness, 223 



Self-consciousness, 227 



Structure determines difference 

 between brains, 234 



Smith, Adam, quoted, on rules 

 of morality, 267 



Thing-in-itself not practical or 



desirable, 13 



Time, a change of forms, 18, 37 

 Truth is what works, 19 



is relative not absolute, 203 

 is the universe, 204 

 Types, formation of, 51 

 Tower 's experiments with the 



potato beetle, 74 

 True species are wild, 76 



Tissue, its renewal, 66 

 Thought, molecular motion of 



nerve tissue, 114 

 based on self-preservation, 



160, 230 



not reasonable, 161, 214 

 reproduction of sensations, 



168 

 none without brain and 



environment, 207 

 always accompanied by 



physical marks, 228 

 Thompson, J. J., quoted, differ- 

 ence between him and 

 Bayson, 209 



Touch, the primal sense, can be 

 called consciousness, 218 



Unknowable Absolute, 8 

 Uranus and its satellites, 30 

 Utility of investigation, 103, 104 

 Unity of definitions, 239 

 United States, an example, 255 



Volcanism, constantly in ac- 

 tion, 10 



' ' Vital Impetus, ' ' not known, 18 



Von Baer, founder of em- 

 bryology, 41 



Vegetable and animal life, com- 

 pared, 42, 98, 106 



Von Mohle, named protoplasm 

 as life basis, 46 



Variation, a law, .17 

 adaptive, 59 

 of form, 92 



Vigor, in offspring, 78 



Yen us 's Fly Trap, 118 



Vivi -section, its effect on 

 psychic phenomena, 120 



Verworm, Max, quoted, 163 



Weissmanism, 39, 88, 100 

 Wallace, Alfred R., 40, 68, 150 

 Whale, The, a mamma], 44, 45 

 Wilson, E. B., quoted, 86 

 Webber, Prof., on Mendelism, 



101 



"Will", 129 

 Wasp, compared with man, 183 



