Index. 



221 



T. 



Telegony, 77-79, no, 141 et seq., 

 191 et seq. 



Transmission of acquired char- 

 acters, see Acquired characters. 



Twins, identical, 41. 



U. 



Unicellular organisms, reproduc- 

 tion of, 16 ; action of environ- 

 ment on, 23, 147 et seq. ; poten- 

 tially immortal, 23 ; natural 

 selection and the, 24, 57, 114; 

 and the origin of hereditary in- 

 dividual variations, 100. 



V. 



Variation, see Congenital varia- 

 tions, Acquired characters, &c.; 

 Darwin on the causes of, 102; 

 Weismann on the origin of, 



153. 

 Veitebrates, reproductive cells of, 



74- 

 Vestigial organs, persistence of, 



Vines, Prof. S., criticism on 

 Weismann, 14, 75, 90, 99, 152, 

 178 ; on the Basidiomycetes, 90. 



Vries, De, theory of heredity, 2 ; 

 on germ-plasm, 54; on the 

 chromatophores of Algae, 83, 

 in ; on Xenia, 144. 



W. 



Weismann, Prof. August., 

 theory of germ-plasm, 5, 17, 

 173 et seq. ; on the duration of 

 life, 7, 10; onthe essential meaning 

 of sexual propagation, 11, 103, 

 135, 141 ; on natural selection 

 as the origin of sexual repro- 

 duction, 14; on Prof. Vines' 

 criticism, 14, 90, 99, 178 et seq. ; 

 on the Protozoa and natural se- 

 lection, 15, 102 ; on Lamarck, 

 16; on adaptive development, 

 19; and natural selection, 21; 

 summary of theory of germ- 

 plasm, 23 ; theory of organic 



evolution, 26, 48, 50, 58,66, 68, 

 87, 100, 104, 106-108,114-115, 

 147 ; modifications of theory of 

 heredity, 28, 46, 52, 65, 68, 75, 

 163 et seq. ; and of self-mul- 

 tiplicat : on of idio-plasm, 34 ; 

 on ' ' ontogenetic grades," 35, 

 53 ; on the modification of germ- 

 plasm, 36 ; on chromatin, 38 ; 

 on individual differences, 39, 

 41, 43 ; on the size of ova, 

 39 ; on polar bodies, 40, 42, 46, 

 125; on the number of germ- 

 cells, 44-45 ; on parthenogenetic 

 ova, 45, 89, 91 ; examination 

 of his theory of germ-plasm or 

 heredity, 48, 85 ; on the stability 

 and continuity of germ-plasm, 

 49, 63, 66, 86-89, 91-93, 99- 

 100, 103-105, 107, 109-110, 

 112-114, 120, 151, 158; com- 

 parison of his theory with those 

 of Darwin and Galton, 51, 58 ; 

 on Strasburger's criticism of his 

 theory, 52 ; on the multiplication 

 of germ-plasm in the general 

 cellular tissues of plants, 53; 

 on regeneration in plants, 53 ; 

 anticipated by Galton, 59, 68; 

 and Galton, 63, 130 et seq.; 

 on transmission of acquired 

 characters, 67, 83, 96, in, 

 127 ; and his critics, 70 ; on the 

 Hydromedusae, 71, 109; onthe 

 sexual apparatus of In vertebrates, 

 72 ; and the influence of germ- 

 cells upon somatic tissues ^Tele- 

 gony and Xenia), 80-81, 196 

 et seq. ; and the significance 

 of grafting, 81-82, 126; and 

 vestigial characters, 92 ; on 

 Hoffmann's investigations, 93 ; 

 on bud-variation, 95, 97, 161 ; 

 on the origin of hereditary 

 individual variations, 100-101 ; 

 on the origin of new species, 10 1. 

 Wounds, healing of, 34. 



X. 



Xenia, 78-S1, no, 141, l^etseq. 



THE END. 



