SUBJECT INDEX 



753 



Reproductive period, length of, 623 



Reptilia, breeding season in, 21 ; poly- 

 spermy in, 183 ; biochemistry of sexual 

 organs in, 289 ; longevity in, 722 



Respiration, in placenta, 394, 464 sq., 

 504 sq. ; during senescence, 718 



Respiratory exchange, effect of castra- 

 tion on, 389 3q. ; during pregnancy, 

 552 sqq. 



Respiratory quotient, of developing egg, 



V 284 ; of mammaUan embryos, 286 ; 

 during pregnancy, 465 ; in rabbit, ib. ; 

 in guinea-pig, ib. ; of baby, '505; of 

 foetus in guinea-pig, 552 sq. 



Rest period, in menstrual cycle of man, 

 74 aq. ; in menstrual cycle of monkeys, 

 85 ; in uterine cycle of Carnivora, 93 ; 

 in uterine cycle of Ungulata, 103 



Rete testis, 160, 240 



Retraction, mechanism of, 262 sqq. 



Retractor penis muscle, 263 



Mhacophorus leucomystax, breeding season 

 in, 20 



Bhizocephala, hermaphroditism in, 692 



Rigor mortis, cause of, 728 



Ring-dove, vitality of spermatozoa in, 

 177 ; sex - determination in, 685 ; 

 longevity in, 723. See also Pigeon 



Rodeutia, dioestrous cycle in, 34 ; oestrous 

 cycle in, 39 ; uterine cycle in, 100 sqq. ; 

 oUtoris in, 261 ; placenta of, 408, 451 ; 

 yolk-sac in, 421 sqq. ; glycogen storage 

 of, in, 538 ; importance of carbohydrates 

 in foetus of, 545 ; glycogen in placenta 

 of, 553 ; fat in placenta of, ib. ; puer- 

 perium in, 584 ; teat of, 587 ; size of 

 litters in, 623 sq. ; fertility in, 629 ; 

 puberty in, 714 



Roe-deer, period of gestation in, 43 n. sq. 



Rontgen rays, effect of, on testes, 330 ; 

 effect of, on human ovary, 347 ; as 

 cause of sterility, 645 sq. 



Rorquals, breeding season in, 48 



Round- worm, form of spermatozoa in, 169 



" Royal food " of queen bee, 664 sq. ; 

 nitrogenous substances in, 665 ; fatty 

 substances in, 665 ; glucose in, ib. 



Ruminants, sexual season in, 45 ; tropho- 

 blast in, 439 sq. ; uterine milk of, 510 ; 

 glycogen in placenta of, 538 ; fertility 

 in, 629 



Russia, sex-ratio in, 687 



Buticilld phcenicurus, intersexualitv in, 

 341 



Rutting season, 32 sq. ; in camel, 24 



Saccocirrus, fertilisation in, 184, 193 

 Saccvlina, 295 sq., 691 ; effects of, on crab, 



326 

 Sacral nerves, 270, 560 

 Sagartia ^troglodytes, breeding habit of, 



8 ; longevity in, 721 



Salamander, sexual activity in, 21 ; life 

 cycle in, 227 sq. 



Salmine, 306 ; in spermatozoa, 303 ; 

 composition of, 304 sq. 



Salmon, breeding season in, 17, 31 ; 

 phenomena associated -with breeding 

 in, 26 sq. ; periodicity in breeding in, 

 29; biochemistry of sexual organs in, 

 303 sqq. ; spermatozoa of, 306 



Salts, metabolism of, during pregnancy, 

 547 sqq. 



Salt-water minnow, see Fundulus 



Sanderling, breeding season in, 22 



Sarcophytum, breeding season of, 8 



Sauropsida, 415 ; yolk-sac of, 411 



Saw-flies, sex-determination in, 667 



" Schlussplatte," 396 



Seiurus vulgaris, oestrous cycle in, 38 



Sclerophytwm, breeding season of, 8 



Scombrine, 304, 305 



Scrotum, 164 n., 165 



ScylUum, egg-membrane in, 289 



" Sea-grapes," 292 



Seal, period of gestation in, 30 ; oestrous 

 cycle in, 54. See also Harp seal and 

 Fur seal 



Season, influence of, on milk, 596 sqq. 



Sea-urchin, breeding season in, 14 ; 

 fertihsation in, 236. See also under 

 Generic names 



Sebaceous glands, 587 



Secondary gexual characteristics, in cap- 

 tive birds, 629 ; growth of, in man, 713 



Segmentation cavity, 405 



Selection, gametic, 210 



Self-fertility, of Cynthia partita, 215 ; 

 of Oiona inteslivMlis, 216 : of Strongy-. 

 locentrotTis, ib. 



Self-steriKty, of Abutilon, 215 ; of Lobelia, 

 ib. ; of Oncidium, ib. ; of Ciona intes- 

 tinalis, ib. 



Semen, 160, 169 sq. ; number of sperma- 

 tozoa in, 169 sq. ; ' effect of sexual 

 activity upon, 170 ; course of, 268 ; 

 constituent secretions of, 296 ; char- 

 acteristics of, ib. ; chemistry of, ib. ; 

 quantity ejaculated, ib. sq. ; composi- 

 tion of, in dog, 297 ; composition of, 

 in horse, ib. ; composition of, in man, 

 ib. ; composition of ash of, in man, ib. ; 

 organic substances of, 298 



Seminal fluid, see Semen 



Seminal granules, 164 



Seminiferous tubules, 161 sqq., 241 ; 

 spermatogonia of, 162 ; cells of SertoU 

 of, ib. sq. ; spermatocytes of, ib. ; 

 spermatids of, ib. 



Semnopithecus entellus, breeding season 

 in, "57 ; menstrual cycle in, 84 sqq. 



Semnopithecus nasicus, placenta of, 491 ; 

 trophoblast of, 491 



Senescence, 718 sqq. ; in Protozoa, 6 ; 

 in man, 718 sqq. ; changes consequent 

 upon, 718 ; bones during, ib. ; muscles 

 during, ib. ; arteries during, ib. ; liver 



