658 



SUBJECT-INDEX. 



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



brissw, 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 deflniteness 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, 655-0, 678-84, 

 686-9; neural and haemal traits, I, 

 683; differentiation of organs, II, 

 303; castration and growth, II, 

 459; Julin on " castration parasi- 

 taire " 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 

 Microstomida, II, 102; Protodrilus, 

 II, 125. 



Silica, colloid and crystalloid, I, 16. 



Silicic acid: properties, I, 16; isom- 

 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. 



Sirenia, simulated fish form, I, 485. 



Size (see Growth). 



Skeleton, vertebrate (see Vcrte- 

 brata). 



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. 



" Skin friction," 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 

 diatomacccr, 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). 



" Social organism," author's essay 

 on, I, 363, 676. 



Sociology: environment and degree 

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



