SUBJECT INDEX 



753 



Reproductive period, length of, t>2.'! 

 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, 405 : in rabbit, ill. ; 



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 testi>. liio. 2 to 

 Retraction, mechanism of, 2>2 sqq. 

 Retractor penis muscle, 263 

 lOtOOOpkonu l> iirniii i/.it'i i\ breeding season 



in, 20 



Rhizocepliala, 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 ; cestrous 



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 ; si/.e of 



litters in. 623 *q. ; fertility in. r.2! ; 



puberty in, 714 



Roe-deer, period of gestation in, 43 n. w/. 

 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 



l!o\al food " of queen bee, 664 sq. ; 



nitrogenous substances in, 665 ; fatty 

 substances in, 665 ; glucose in, ib. 

 Ruminants, sexual season in. 4f> ; tropho- 



blast in, 439 sq. ; uterine milk of. .~>lo : 

 glycogen in placenta of, 538 ; fertility 



in. 629 



Russia, sex-ratio in, 687 

 RlltifiUn /,li nil- ii nix, iitterscxiialitv in, 



341 

 Rutting season, 32 sq. ; in camel. 24 



Saccocirrus, fertilisation in, 184, 193 

 Sacculiiia, 295 #q.. 691 ; effects of. on crab, 



326 



Sacral nerves. L'TO. r>iio 

 Sagartid f/v//W///-.y. 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 Fundnlin 

 Sanderling, breeding season in, 22 

 Sarcophytum, breeding season of, 8 

 Sauropsida, 415 ; yolk-sac of, 41 1 

 Saw-flies, sex-determination in, i>i>7 

 " Schlussplatte." 396 

 iS'c/n/.s- rulijari*, (estrous cycle in, 38 

 Sclerujihi/tinii. breeding season of, 8 

 Scombrine, 304, 305 

 Scrotum, 164 ti., 165 

 Scyttium, egg-meinbrane in, 289 

 " Sea-grapes/' 292 

 Seal, period of gestation in, 30 ; rcstrous 



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, 23(i. Xee nlo under 



Generic names 

 Sebaceous glands, 587 

 Secondary sexual eharnc -teristies, in cap- 



tive birds, 62!) ; growth of. in man, 713 

 Segmentation cavity. 4O.~> 

 Selection, gametic, 210 

 Self-fertility, of ('if nth in pnrliln, 215; 



of Ciomi infi-*tin<i!i*. 216 ; of -St 



Self -sterility, of Al>utiln. 215 ; of Lol>< I'm. 

 ib. ; of Oiifiiliinii. ib. ; of Ciona intes- 

 ti/tuli*. Hi. 



Semen. 16O. Itiii .,(/. ; 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, 16. ; 

 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. 2!l* 



Seminal fluid. *< Semen 



Seminal granule--. Ilil 



Seminiferous tubules. 161 .<7'/.. 241: 

 spermatogonia of, 162; cells of Sertoli 

 of, Hi. *'/. : spermatocytes of. il>. ; 

 spermatids of, ib. 



Senino/iil/H'H- < iitilfu*. breeding season 

 in, .~)7 : menstrual cy. le in. SI .sr/f/. 



N. iiin<>/,itlii<-iix iiiixii-H*. placenta ot. 491; 

 trophoblast of, 4 '.I I 



Senescence, 718 sqq. ; in Protozoa, 6 ; 

 in man, 718 sqq. ; changes consequent 

 upon, 718 ; bones during, ib. ; muscles 

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



