532 



INDEX 



Ascaris, fertilization of, J^18 

 "germ track," 132, 133 

 sex differentiation in, 150 

 Ascidian egg, 125, 126, 130, 176 



SS5, 327, 328, 330 

 type, 182 

 Assheton, cleavage of egg of 



sheep, 29 

 Aster, 115, 117 

 Asterias, fertilization of, 20 

 Astral radiations, 116 

 Atavism, 215 

 Athens, 419, 420 

 Athletes, prize, 431 

 Athletics, educational value of, 



492, 493 

 Attica, illustrious men of, 418- 



420 

 Automaton, 475, 477 



Backbone, development of, 25, 



27, 32 

 "Back cross," ratios of, 243, 244 

 Bacteria, reactions to light, 52 



to salt, 55 

 Baldness, inherited, 209 

 Balzac, heredity a maze, 306 

 Barbarism, 372, 408, 424, 502 

 Bardeen, X-rays on sperma- 

 tozoa, 319 

 Bateson, Blue Andalusian, 272 

 brachydactyl hand, 300 

 "homozvgote and heterozy- 



gote," 234 

 on Mendelism, 231 

 on evolution, 404 

 Bateson and Punnett, on sweet 

 pea hybirds, 262, 263, 264 

 Baur, factors for flowers of 

 Antirrhinum, 265 

 on leaf colors, 295 

 induction effects of poor 

 soil, 357 

 Beans, pure lines, 203, 211, 385, 

 Bees, and Ants, 456, 499 



influence of food on devel- 

 opment, 334 



workers, queens, drones, 

 334 

 Beethoven, 489 

 Behavior, dogs, cats, monkeys, 

 69 

 fish and frog, 481 

 lower organisms, 47 

 modifiability of, 73 

 Paramecium, 66-68, 71 

 plasticity of, 75, 480 

 rigidity of, 76 

 test of psychical processes, 



51 

 worms, star-fish, Crustacea, 

 vertebrates, 68-76 

 Biglow Papers, on Lamarck- 

 ism, 343 

 "Biophores" of Weismann, 106 

 Birthrate and deathrate, nor- 

 mally equal, 447 

 both decreasing, 448, 449 

 decreasing most in best fam- 

 ilies, 450 

 in Massachusetts, 451 

 Bivalent chromosomes, 139 

 Blastula, 24, 27, SO 

 "Blending" inheritance, 214 

 286, 288-293. 

 in length of ears in rabbits, 



291 

 in length of skull in rabbits, 



292 

 in skin color of mulatto, 

 288-291, 297 

 "Blood lines," 387 

 Bond, negro X white cross, 297 

 Boule, Chapelle - aux - Saints 



skull, 409 

 Boveri, chromosomes differ in 

 value, 162, 171 

 dispermic eggs, 321 

 Brachydactylism, 205, 300, 302 

 Brain, development, 31 



size and weight, 488, 489 

 Breeder, methods of, 432 

 Broman, death of families, 452 

 Brooks, 220 



