658 



SUBJECT-INDEX. 



Seals: nail-bearing toes, I, 473; vi- 



brissce, II, 317. 

 Seasons: reproductive periodicity, 



I, 299; variations of genesis with, 



II, 484-5. 



Sedgwick, Adam: on continuity of 

 protoplasm in animals, I, 190, 

 629, II, 21; zoological classifica 

 tion, I, 387; discrimination of spe 

 cies in embryonic stages, I, 461; 

 persistence of ancestral traits, I, 

 463-4; Archiannelidan segmenta 

 tion, II, 109. 



Sedgwick, Wm. : heredity and sex, 

 I, 305, 314; telegenic transmission 

 of hypospadias, I, 646. 



Seeds: nitrogenous, I, 40; tempera 

 ture of germinating, I, 47, II, 615; 

 vitalism and latent vitality of, I, 

 116-7; variation in environment, 

 I, 327; natural selection among, I, 

 532. 



Segmentation (metameric): special 

 creation hypothesis, I, 468-9; 

 Huxley on number of somites in 

 higher articulates, ib.; in annu- 

 lose animals, II, 98-110, 111-5, 

 601-5; simulated molluscan, II, 

 116; in vertebrates, II, 125-7, 225-7, 

 606-7; in elasmobranchs, II, 126. 



Segregation: of growth, I, 136; of 

 like units, I, 179; organic repair, 

 I, 221; variation, I, 331, 334; 

 heterogeneity, and definiteness of 

 evolution, I, 514-6, 517-8; mor 

 phological development, II, 7-9; 

 physiological units, II, 616. 



Self-fertilization, animal and vege 

 tal, I, 341-4, 353. 



Senses, the (see Psychology). 



Sex: in Ascidian colonies, I, 247; 

 limitation of heredity by, I, 314-6; 

 correlated traits, I, 371-2, 513; nu 

 trition and determination of, in 

 social insects, I, 655-60, 678-84, 

 686-9; neural and htemal traits, I, 

 683; differentiation of organs, II, 

 303; castration and growth, II, 

 4o9; Julin on &quot; castration parasi- 

 taire &quot; in crustaceans, II, 493-6; 

 the object of fertilization, II, 613. 

 (See also Fertilization.) 



Sexual Selection (see Natural Selec 

 tion). 



Sharp, D. : on insect somites, I, 469; 

 food habits of Termites, I, 686-7. 



Sheep: contrasted with oxen, I, 

 158, 160; crossing of English and 

 French breeds, I, 625; nutrition 

 and genesis, II, 480. 



Sherrington, Prof., on effects of 

 nerve severance, I, 349. 



Ship-building, interdependence of 

 social functions, I, 237-9, 241. 



Shipley, A. E.: segmentation of 

 Hicrostomida, II, 102; Protodrilus, 

 II, 125. 



Silica, colloid and crystalloid, I, 16. 



Silicic acid: properties, I, 16; isorn- 

 erism, I, 59. 



Silicon, allotropic, I, 4. 



Silkworm disease, I, 622-3. 



Simulation: of homology by anal 

 ogy, II, 14, 485; of segmented 

 structure by molluscs, II, 116. 



Siphonophora, specialization of com 

 ponent polyps, II, 95. 



Sircnia, simulated fish form, I, 485. 



Size (see Growth). 



Skeleton, vertebrate (see Verte 

 bra t a). 



Skin: respiratory function, I, 209; 

 adaptability, I, 228, II, 312-4, 

 387; transmitted peculiarities, I, 

 306; Wallace on distribution of 

 sensitiveness, I, 646-7: differen 

 tiation, II, 215, 217, 304-7; tegu- 

 mentary development, II, 314-6, 

 387; differentiation of sensory or 

 gans, II, 317-20; and mucous 

 membrane, II, 303-4, 321-2, 389. 



&quot; Skin friction,&quot; and locomotion of 

 aquatic animals, I, 156. 



Skull (see Vcrtcbrata). 



Sleep, repair favoured by, I, 216. 



Small-pox, blood changes from, I, 

 221. 



Smith, Prof. W., on fertility of 

 diatomacccB, II, 440. 



Smith, W. P., on telegony in calves 

 and foals, I, 645. 



Smith, W. W., on habits of Tetra- 

 morium, I, 660. 



Snakes (see Rcptilia). 



&quot; Social organism,&quot; author s essay 

 on, I, 363, 676. 



Sociology: environment and degree 

 of life, I, 105-6; functional dif- 



