THE LAWS OF HEREDITY 



Vestigial structures, 27, 108 



Virulence, evolution of, 88 



Voluntary action, 371 et seq. ; defined, 376 



Vries, Prof. H. de, on variations of dandelion 

 and hawk weed, 148, 201 ; on mutation 

 theory, 151 ; on Mendelian phenomena, 

 166 ; on latency, 177 ; on mutations of O. 

 lamarckiana, 179 ; on correlated mutations, 

 182 



W 



WALCHEREN, British expedition to, 261 

 Walker, Mr C. E., experiments on hens, 114; 



on chromosomes, 131 

 Wallace, Alfred Russel, on transmission of 



acquirements, 61 ; method of work, 185 ; 



on snails, 202 ; on evolution of mind, 397 ; 



on Darwin, 506 



Wallace, Mr J.^Sims, on teeth, 224 

 Warren, Dr E., on variations in Daphnia 



magna and aphides, 148 

 Wasp, memory in, 418 

 Waterton, on male traits in hens, 113 

 Weismann, experiments on butterflies, 83 ; on 



continuity of germ-plasm, 124 ; on criminal 



selection, 109 ; on revitilization, 147; method 



of work, 185 

 Weldon, Prof. W. F. R., on the Law of 



Ancestral Inheritance, 130 

 Welton, Prof. J., on universe as systematic 



unity, 37 ; on hypothesis and proof, 39-40 ; 



on scientific method, 42 ; on proof, 46 ; on 



natural law, 46, 348, 352 ; on crucial 



instances, 164 



West Indies, disease in, 280 



Whewell, on scientific method, 41 ; on hypo- 

 theses, 48 ; on gravitation, 49 ; on mathe- 

 matical axioms, 347 



Whichura, on crossed natural varieties, 177 



Wicking, on latent traits in pigeons, 116 



Will, the, 373, 374 et seq. ; association with 

 attention, 414 



Williams, The Hon. Mr Sapira, on drinking 

 in West Africa, 302 



Wine, sacramental, 304 



Working hypotheses, 39 



Wright, Dr Strethill, on Hydraidae, 27 



Written symbols, 397 



Wundt, on origin of mind, 368 



YEAST, production of alcohol by, 457 



Yellow fever, 272 



Youatt, on sheep, 70 



Yule, Mr Udney, on Law of Ancestral Inheri- 

 tance, 129-30; on experimental crossing, 

 205 



ZEBRA, crossed with horse, 156, 196 

 Zoology, systematic, 33 ; method by which~.it 



is created, 504 

 Zygote, 153 

 Zymotic disease, 227 



TURNBULL AND SPEARS, PRINTERS, EDINBURGH. 



