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 sq. ; during pregnancy, 



552 sqq. 

 Respiratory quotient, of developing egg, 



284 ; of mammalian 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 sq. ; 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 

 Rhacophorus leucomystax, breeding season 



in, 20 



Rhizocepkala, 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 

 Rodentia, dicestrous cycle in, 34 ; oestrous 



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



clitoris 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. 

 Ro'ntgen 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 ; 



glyeogen in placenta of, 538 ; fertility 



in, 629 



Russia, sex-ratio in, 687 

 Ruticitta phasnicurus, intersexualitv in, 



341 

 Rutting season, 32 sq. ; in camel, 24 



Saccocirrus, fertilisation in, 184, 193 

 Sacculiiia, 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 



Sciurus vulgaris, oGstrous cycle in, 38 



Sclerophytvm, breeding season of, 8 



Scombrine, 304, 305 



Scrotum, 164 n., 165 



Scyllium, 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 ; 

 fertilisation in, 236. See aUo under 

 Generic names 



Sebaceous glands, 587 



Secondary sexual characteristics, in cap- 

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



Segmentation cavity, 405 



Selection, gametic, 210 



Self-fertility, of Cynthia partita, 215 ; 

 of dona inteslinalis, 216 : of Strongy- 

 locentrotuA. ib. 



Self -sterility, of Abutihn, 215 ; of Lobelia, 

 ib. of Oncidium, ib. ; of dona 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 Sertoli 



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



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 



