SUBJKCT INDKX 



755 



Spermatocyte, 162 sq,, 166 



Spermatogenesis, 159 sqq., Chapter V., 

 passim ; spermatocyte stage of, 162 sq. ; 

 spermatid stage of, 162 sq. ; changes 

 during, 166 



Spermatogonia, 162, 166 



Spermatotoxins, 165 n. ; in rabbit, 164 . 

 sq. ; in guinea-pig, ib. 



Spermatozoa, 299 ; in uterine glands, 

 97 sq. ; maturation of, 126, 159 ; 

 -tructure of, 166 sq. ; axial filament 

 of, 166 sq. ; dimorphism of, 166 ., 

 168 ; achrosome of, 166 sqq. ; centro- 

 some of, 167 ; shape of head of, ib. ; in 

 Triton. 168 ; in man, 168 : middle piece 

 <>f, H>. ; tail of, i6. ; in Polyphemus, 

 ib. ; in PulitiliiHi. il>. ; size of, ib. ; 

 form of, in bat, 169 ; in sheep, ib. ; 

 in frog. i'6. ; in pig, ib. ; in finch, ib. ; 

 in ram, ib. ; in boar, ib. ; in jelly-fish, 

 ib. ; in monkey, ib. ; in round-worm, 

 ib. ; in crab, ib. ; number of, 169 sq., 296 ; 

 movements of, 170 sqq. ; in bat, 170 ; j 

 in cockroach, 171 ; in Echinoidea, ib. ; i 

 in Sphcerechinus, 172 ; in Arbacia, ib. ; ! 

 in Echinus, ib. sq. ; in rabbit, 173 sq. ; \ 

 in man, ib. ; longevity of, 177 sq. ; 

 in rabbit, 177 ; in dog, 16. sq. ; in j 

 fowl, 177 ; in man, ib. ; in bat, ib. 

 sq. ; in Tropidonatus viperinus, 178 ; 

 in Salamander manulosa, ib ; in 

 earthworm, ib. ; in snail, 179 ; in 

 bees, ib. ; in ants, t6. ; path of, in 

 ovum, 186 ; of Strongylocentrotus, 211 ;; 

 in-breeding and virility of, 219 ; chemo- i 

 taxis of, 224 ; nature of fertilising j 

 action of, 234 sqq. ; chemistry of, 302 ; 

 sq. ; phosphorised fats in, 302 ; choles- 

 terin in. ib. ; lecithin in, 303 ; iron in, | 

 311; functions of, 318; preservation 

 alive of, 649 sq. ; dimorphism of, in 

 Pyrrhjcoris, (572 ; in Ptilmlimi. ib. ; in 

 AIHI.III tri.iti*, ib. ; in Galgnlus oculatus, 

 673 ; in Lygu-us bicruris, ib. ; in pig, 

 678 n. ; in horse, ib. ; formation of, 

 during senescence, 720, 727 



Spermine, 299 sq., 328 



SptrmopkOtH, formation of corpus luteum 

 in, 145 



Sphcerechinus, movements of spermatozoa 

 in, 172 



Sphcerechinus granularis, chemistry of 

 spermatozoa of, 306 



Sphincter vaginae, 267 



Sphingomyelin, 274 



Spider, sex-determination in, 678 



Spider crabs, parasitic castration in, 326 



Spiny mouse, see Acomys cahariim* 



Splanchnopleur, 412, 414 ; of bat, 489 



Sponges, hermaphroditism in, 688 sqq. 



Spongiosa of man, 498 



Squirrel, see Sviurus uulgari.* 



Stalchen, 437, 43!t. H 1 



Stag, antlers of, 25, 46 ; rutting of, ib. ; 

 effect of castration on, 321 



Starfish, 318 ; breeding season in, 14 ; 

 aids to fertilisation in, 229 



Starling, incubation period of, 23 



Stearic acid in yolk of egg, 283 



Stearin in milk, 594 



Stegomya, 12 H. 



Stenops, clitoris in, 261 



Stereozilien, 398 



Sterility, 248 ; in confined animals, 5 ; 

 in Death's-Head hawk moth, 11 ; in 

 hybrids, 210 ; of mule, 211 ; of Echinti-a 

 crosses, t'6. ; in horses, 216 ; and 

 in-breeding, 216 sqq. ; caused by per- 

 sistent corpora lutea, 374 ; due to 

 captivity, 628 sq. ; in Indian elephant, 

 628 ; cause of, in bears, 629 ; in hawk, 

 ib. ; in birds, 629 sq. ; in caged rats, 

 631 ; due to overfeeding in horses, ib. ; 

 caused by excess of sugar, 16. ; caused 

 by excess of molasses, ib. ; caused by 

 excess of linseed, t'6. ; in cattle, 631, 

 641 ; caused by fatness, 632 ; in mice 

 due to fatness, t'6. ; in man, t'6. ; effect 

 of in-breeding and cross-breeding on, 

 639 ; between genera, 640 ; between 

 species, ib. ; in Drosophila, 641 ; of 

 hybrids, t'6. ; cause of, in hybrids, 642 ; 

 of horse-zebra cross, t'6. ; causes of, 

 644 sqq. ; syphilis as cause of, 645 ; 

 epididymitis as cause of, 16. ; due 

 to X-rays, 6. sq. ; causes of, in 

 man, 646 ; causes of, in cattle, 6. ; 

 causes of, in horse, ib. r due to con- 

 tauious granular vaginitis, ib. ; due 

 to alcoholism in rats, 647 ; overcoming 

 of, by artificial insemination, 647 sqq. ; 

 importance to breeding industry, 658 ; 

 in horses, t'6. 



Stickleback, phenomena associated with 

 breeding in, 28 



Stoat, oestrous cydo in. .~>:5 sq. ; interstitial 

 cells in ovary of, 120 n. 



Striated border of syncytium, 397 



Stronglocenirotus, oxidation in ovum of, 

 188, 191 ; fertilisation in, 194 sq. ; 

 prepotency of spermatozoa of, 211 ; 

 hybridisation of, 212 sq. ; self-fertility 

 in, 216 



Strongylocentrotus purpuratus, 314, 318 ; 

 parthenogenesis in, 232 



Strychnine as cure for impotence, 638 



Stychostemma asensoriatum, breeding sea- 

 son in. 9 



Stylonychia, conjugation in, 221 



Stylonychia puslulata, rate of fission in, 6 



Sugar, in egg of fowl, 277 ; in urine of 

 pregnancy, 539 sq. ; in blood of preg- 

 nancy, 540 ; in blood of labour, 16. ; 

 in blood of puerperium, ib. ; formation 

 of, in milk, 602 sqq. ; sterility caused by 

 excess of, 631 



Suidae, fertility in, 628 



Sulphur in pregnancy, 551 



" Summer cells " of frog, 385 



Superfcetation, 154 ; in cat, ib. 



