354 



Index 



Internal secretions, effects of, 224 

 Intersexes, 166 



Intra-cellular pangenesis, 199 

 Inverse Symmetry, 191, 193, 194, J 95 

 Irritability, 9 



Isolation of substances in cells, 

 201 

 in protozoa, 201 



James, William, 315 

 Jennings, action of selection, on 

 Paramecium, 255 



on DifHugia, 257 



behavior of Paramecium, 47 



behavior of Stentor, 50 



inheritance of size in Parame- 

 cium, 67 



on Galton's law, 80 



on potential personalities, 316 



rapid breeding of Paramecium, 



115 

 training of star-fish, 51 



Jerome, St., 2,2> 



Jews, mixture with Gentiles, 284 



Johannsen, action of selection, 255 

 genotype and phenotype, 127 

 inherited weight of seeds, 66 

 "pure lines," 255, 257 



Johnson, marriages of college wo- 

 men, 291 



Kammerer, effects of colored soil on 

 salamanders, 236 



Keibel, development of human em- 

 bryo, 27, 28, 30 



Keratosis, 117 



King, modification of sex ratio, 165 



Korschelt and Heider, Symmetry 

 of egg of Musca, 191 



Lane, development of vision, 31 _ 

 Lamarck, on inheritance of acquired 



characters, 227 

 Lamarckian Hypothesis, 235 

 Lamarckism, 32 _ 

 Lang, snail hybrids, 105 

 Laws on Eugenics, 286 

 Learning by experience, 49, 312 

 Left-handedness, inheritance of, 68 

 Lens, cataract, 66, 118 



development of, 225 



displaced, 118 



weight of, 66 



Leptinotarsa, selection in, 255 

 Lethal factors, 104 



sex-linked, 185 

 Life, artificial production of, 206, 207 



conditions limited, 306 



definition of, 6 



maze of, 311 

 Lillie, on fertilizin, 170 



on "free martin," 167 



sex determination, 167 

 Limbs, transplanted, 226 

 Lincoln, 288 



Linkage of Characters, 180 

 Localization of Pattern, 192 



in eggs of ctenophore, flat-worm, 

 echinoderm, annelid-mollusk, 

 chordate, 196 

 Localization of substances in cells, 



142 

 Loeb, J. Artificial parthenogenesis, 

 134, 169 



reflexes, 39 



tropisms, 43 

 Logic, as test of truth, 305 

 Loligo, symmetry of the egg, 191 

 Longevity inherited, 68 

 Lotsy, source of variations, 261, 263 

 Lowell, Biglow Papers, 227 

 Luxury, cause of infertility, 295 



in education, 317, 318 



Macfarlane, on Dionaea, 44 

 McClendon, production of one-eyed 



monsters, 169 

 McClung, on sex determination, 158, 



177 



on mammalian chromosomes, 161 



McCracken, maternal inheritance, I 



112 

 McDougal, influence of chemicals on 



ovules, 210 

 MacDowell, size in rabbits, 110 



Selection in Drosophila, 257 

 McGregor, Restoration of Pithecan- 

 thropus skull, 271 

 Male babies, greater mortality, 166 

 Malthus, theory of, 285 

 Man, controls destiny, 272 



dominant races of, 273, 274 



evolution of, 270 



extermination of, 274 



extinct types of, 271 



