SUBJECT-INDEX. 



661 



Tissue, Hertwig's classification, I, 

 189. (See Physiology.) 



Tongue, perceptiveness of tip, I, 

 606-8, 665, 672-3. 



Tortoise: contrasted life of dog 

 and, I, 103-4; natural selection 

 and carapace, I, 534. 



" Transcendental Physiology," I, 

 176. 



Tree, as symbolizing phylogeny, I, 

 428, 452-3. (See Plants.) 



Trematoda: agamogenesis, I, 277; 

 parasitism, I, 428; alternate gen- 

 eration, I, 592. 



Trembley, A., on the polyp, I, 223. 



Trichinosis, in Germany, I, 428. 



Trochophore, phyletic relationships 

 shown by, I, 447, II, 108-9. 



Tubicola: development, II, 100; bi- 

 lateral symmetry, II, 197. 



Tunicata: gemmation, I, 588, II, 445; 

 alternate generation, I, 592; inte- 

 gration, II, 93-4; tertiary aggre- 

 gation, II, 124; symmetry, II, 

 194-5. 



Tunny, size of ova and adult, I, 

 144. 



Turbcllaria: segmentation, II, 102; 

 symbiosis, II, 400. 



Turnip: chlorophyll in roots, I, 209, 

 II, 254; vascular system, II, 281, 

 284, 578, 591, 596. 



Twins: similarity of, I, 324; traits 

 of women bearing, II, 457. 



" Types, persistent," Huxley on, I, 

 408. 



ULCEK, dermal structure, II, 306. 



Ultimate Reality, incomprehensibil- 

 ity of, I, 120. 



Viva: cell multiplication, II, 26; 

 outer tissue, II, 256. 



Umbelliferw: floral symmetry, II, 

 171; axial and foliar organs, II, 

 541-6. 



United States: cases of telegony, I, 

 644-5; birth rate, II, 520. 



Units: differentiation and dissimi- 

 larity, I, 20; " protyle," I, 22-3; 

 shapes in higher types, I, 164; 

 differential assimilation, I, 180; 

 primordial organic, I, 181; mor- 

 phological composition, I, 184-7, 

 194, 252, II, 5, 7-9, 21, 79, 85-6; 



segregation and organic repair, I, 

 221-2, 222-6; chemical, morpho- 

 logical, and physiological, 1, 225-6; 

 II, 612; stability, I, 339; instabil- 

 ity and heterogeneity of organic, 



I, 350; Darwin's gemmules, I, 

 356-60, 362, 372; Weissmann's 

 germ-plasm (q. v.) i&.; sociological 

 comparison, I, 363-8; specific pro- 

 clivities in embryogeny, I, 458; 

 phaenogamic, II, 73, 151; annulose, 



II, 105; incident force and ho- 

 mologous, II, 159; morphological 

 summary, II, 233. (See also Phy- 

 siological units.) 



" Universal Postulate," I, 675. 

 Unsymmetrical, definition, II, 131. 

 Urea, muscular energy and excre- 

 tion, I, 72. 



VAN BENEDEN, P. 3., on Tania, II, 

 103. 



Variation: digital, I, 331; effects of 

 parental conditions, I, 324; of al- 

 tered function, I, 325, 334, 693; 

 dissimilarity of initial conditions, 



I, 327-32, 333; " spontaneous," I, 

 328, 513, 697, II, 529; persistence 

 of force, I, 335; physiological 

 units, I, 348-54, 360, 369, 371-3, 



II, 614-7, 622-3; Weismann's 

 germ-plasm theory, I, 357-8, 

 372-3, 671, 677; II, 622; equilibra- 

 tion and vegetal, I, 523-5; Weis- 

 mann's panmixia theory, I, 561-3, 

 649, 667-9, 671, 685; reproductive 

 organs, I, 570; natural selection 

 and concomitant, I, 614-21, 653, 

 664, 674, 692; and disused organs, 

 I, 648, 668; plus and minus, I, 

 667, 685; Masters on correlated, 

 in plants, II, 298, 621-2; equili- 

 bration of favourable, II, 394. 



Vascular System: effects of vegeto- 

 alkalies, I, 55; nutrition, I, 146, 

 148; embryonic development, I, 

 169; structural traits, I, 192, 193; 

 function, I, 199; of Ascidians, I, 

 202; functional differentiation and 

 integration, I, 205-6; organic re- 

 pair, I, 217, 221-2; effect of func- 

 tion, I, 229, 234-5, 236; equilibra- 

 tion, I, 535; community in com- 

 pound organisms, I, 588; develop- 



