INDEX. 



293 



Jager on continuity of germ-proto- 

 plasm, 88 



Katabolism, see Protoplasm 



Knight, experiments on water-melons, 



Kolliker on origin of spermatozoa, 

 103 



Lactation, 230, 231 

 Lamarck, 277 



Laulanie" on embryonic hermaphrodit- 

 ism, 27, 28, 60, 61 

 Leeuwenhoek, 79, 104, 147 

 Limit of growth, 204-207 

 Liverwort, 210 

 Love, 244-259 

 Love for offspring, 250-253 

 Luciola, 21 



Magosphaera, 236 



Males, 3-47 passim; variability, 10-12; 

 activity, 14, 15; size, 17; pigmy, 

 J 5. J 7> 7 1 , 73". color, 20 ; predomin- 

 ant katabolism, 21 ; complemental, 

 71, 73; psychical characters, 280 



Male-cell, see Spermatozoan 



Malpighi, 78 



Malthus, 262, 267, 268 



Malthusianism, 267-269 



Mammals, love among, 246, 247 



Mammary glands, 230, 231 



Mantegazza on sexual characters, 

 9-12 



Marsupials, 233, 234 



Maternal sacrifice, 236, 237, 238 



Maupas on conjugation and multipli- 

 cation of infusorians, 140, 141, 210, 

 211, 217, 218; on uses of fertiliza 

 tion, 152-155 ; on theory of organic 

 immortality, 240 



Mayflies, 238 



Meehan, investigations on sex of 

 plants, 42, 43 ; on cross-fertilization, 



7i 



Menstruation, 225, 226 



Mesozoa, liberation ol germs in, 54, 

 236 



Metabolism, see Protoplasm 



Micropyle, 97 



Microstomum, 181, 208 



Miescher on the milt of salmon, 109 



Migration of sex-cells, 53 



Milk, 231 



Minot on polar globules, 100 ; theory 

 of genoblasts, in, 124; on parthe- 

 nogenesis, 168, 190 



Mivart on sexual selection, 12 



Molluscs, hermaphroditism anions;, 

 68 



Molothrus, 256 



Moohwort, 209, 210 



Moss, alternation of generations, 185, 



189, 190 

 Myzostomata, hermaphroditism of, 



73 



Natural selection, a check on diver- 

 gence of sexes, 25 ; scope of, 279, 

 282, 285, 286, 288 



Nematodes, alternation of sexual 

 generations in, 192 



Neo-Malthusianism, 268-274 



Notodelphys, 234 



Nototrema, 234 



Nucleus, behavior in fertilization, 136, 

 137 ; essential elements of, 222 



Nussbaum, 88, 149 



Nutrition, influence on sex, 36 



Nutrition versus reproduction, 207- 

 209 



Nutrition of young, 230 



Obstetric frog, 234, 



Organs of reproduction, 51-58 



Orthonectids, bursting of female, 237 



Oviparous animals, 229 



Oviparous mammals, 229 



Ovipositors, 56 



Ovists, 79, 80, 147 



Ovo-viviparous animals, 229 



Ovulation, 224 



Ovum, 92-102 ; envelopes of, 97; 



maturation of, 98-101 ■ liberation of, 



224 

 Ovum theory, 77-78 

 Owen on somatic and reproductive 



cells, 88 ; on residual spermatic 



force, 196 



Pedogenesis or juvenile partheno 



genesis, 161, 162 

 Pairing, early forms of, 244, 245 

 Paper nautilus, brood-shell of female, 



235 



Paramecium, conjugation of, 140 



Parental care, 250-253, 286 



Parental sacrifice, 236, 237 



Parthenogenesis, 158-174 



Parturition, 229, 230 



Penis, 55, 228 



Prliiger on polyspermy, 29 ; on sex in 

 tadpoles, 36 



Pigments, expressions of disruptive 

 processes, 20 



Pigeon's milk, 231 



Placenta, 229 



Planarians, multiplication of, 211 



Plants, determination of sex in, 42, 

 43; origin of sex amoug, 119, 120 

 conjugation in, 135 ; fertilization in, 

 132, 149; parthenogenesis in, 164, 

 165 ; asexual reproduction of, 177, 

 178 



