270 



INDEX 



THOMSON (J. A.), on the influence of 

 environment, 179 ; on heredity, 225 



Thuja occidentalis^ influence of ex- 

 ternal conditions, 222 ; dwarfed, 71 



Thnjopsis dolabrata variegata, 59 



Thytnus serpyllum, 55, 91 



TICHOMIROFF, on artificially induced 

 parthenogenesis, 197 



TILLET, on investigations with artifi- 

 cial soils, 198 



TOURNEFORT, 95 ; on varieties of 

 Brassica oleracea, 177 



Toxicity of plants varies according to 

 their different parts, 142 



Tradescantia virginica, variation of 

 an individual plant in respect of 

 flower-ir.orphology, 101 



Transmutation of one micro-organism 

 into another, 126 



Trifoliuin molineri, form of T. incar- 

 natum, 219 



Triton, 112 



TROCHU, on the non-spiny form of 

 Ulex europceus, 92 



Tropceolum , influence of external con- 

 ditions, 222 



Tuberculosis, comparative immunity 

 of Mongolians, 124 



Turbo thermalis, 205 



TURREL, on the non-spiny form of 

 Capparis spinosa, 92 



Tylenchus devastatrix acquiring pecu- 

 liar characters from living on one 

 species of plant only, 206 



U. 



Ulex europceus devoid of spines, 

 92 ; Ulex nanus, 92 ; U. major, 

 form of U. paiviflorus, 219 ; U. 

 europceus, 245 



Unio's variations in form and colour, 

 94 ; living in sea-water, 185 



Urodela, 112 



Use and disuse, a factor in evolution, 

 230 ; proposed experiments, 239 



Ustilago antherarum, influence on 

 sexuality, 108 



dimensions, 70 ; integuments, 89 ; 

 form, 93 ; leaf, 97 ; fruit, 99 ; flower, 

 101 ; personal, 125 ; universal, 147 ; 

 sudden, 152 



Variations, osteological, 103 ; visceral, 

 105 ; sexual, 107 



Variegation and environment, 54 ; 

 Carriere on, 58 ; some localities un- 

 favourable to variegation, 58, 59 ; are 

 variegated plants weaker than 

 others, 59 ; sudden variegation, 59 



VARIGNY (DE), on history of evolution- 

 ary notions, 17 ; on the loss of 

 weight in Coelenterates during 

 inanition, 77 ; on dimensional varia- 

 tions (experiments on Lymncea), 79 ; 

 on abnormal prolongation of tadpole 

 condition, in ; influence of brucin, 

 strychnine, and picrotoxine on com- 

 mon crab, 120 ; observations on 

 normal variation among individuals 

 of the same brood of Lymncea, 137 ; 

 on the influence of heat on seeds, 

 137 ; on the influence of sulphate 

 of copper and of strychnine on 

 seeds, 138 ; experiments on accus- 

 toming marine animals to live in 

 fresh water, 187 ; experiments on the 

 adaptation of fresh-water forms to 

 life in saline media, 189 



VARRO, 158 



Venus, transferred to fresh water, 186 



Veratrin, influence on green and brown 

 frogs, 131 



Verbascum lychnis, 54 



Vigour and colour, 69 



VILMORIN (L. DE), on changes of colour 

 due to culture, 53 ; on variegation, 

 59 ; on Ulex nanus and europceus, 

 93; experiments in selection, 236, 237 ; 

 experiments on beet-root, 238 ; on 

 selection generally, 241 



Visceral variations, 105 



Vitis rupestris, predominant heredity, 

 245. 



Vorticellce subjected to high pres- 

 sures, 192 



Vulpes alopex, 50 



VULPIAN, on the influence of poisons 

 on green and brown frogs, 131 ; on 

 the influence of brucine, 132 



Valerian, less toxic when grown on dry 

 soil, 136 



VALLEMONT (DE), on growth in thick- 

 ness partly determined by external 

 influences, 199 



Variability present at all epochs, in all 

 organisms, 147 ; is itself variable, 

 149 ; causes unknown, 150 



Variation among pathogenetic organ- 

 isms under different modes of culture, 

 126 ; in structure, 47 ; colour, 48 ; 



WALLACE (A. R.), on seasonal colour- 

 variation, 52 ; on colour-variation, 

 67 ; on variability of the length of 

 the digestive system, 106 



WEISMANN (A.), on variability in com- 

 mon pansy, 149 ; on acquired 

 characters, 221 ;on selection, 231 



Whales, rudimentary teeth, 39 ; osteo- 

 logical variability, 103 



