INDEX 



627 



Uncertainties in inheritance, 295 

 Unfit, multiplication of, 532 

 Unicellular organisms, multiplica- 

 tion in, 29 ; hereditary relation in 

 31 ; transmission in, 185 

 Unit characters, 366 

 Units, theoretical conception of ele- 

 mentary, 90 



Variability, 100, 268 



Variation, study of, 11, 75 ; discon- 

 tinuous, 82 ; causes of, 100, 103, 

 104 ; and modifications, 176 ; in- 

 dependent, resembling reversions, 

 128 ; inherited and independent, 

 269 ; theory of, 517 



Varieties, " ever-sporting," 95 



Varigny, H. de, on telegony, 147 



Vernon, Dr. H. M., experiments on 

 hybridisation of sea-urchins, 117; 

 variation, 310 



Vestigial structures, 127 



Vicinism, 133 



Villar, S., 147 



Virchow, Prof., 210, 257, 534 



Voigt, experiments on Planarian 

 worm, 35 



Voisin, 235 



Vries, H. de, on reversion, 133, 

 136, 141 ; mutations, 83, 90 ; 

 Pangen theory, 199, 421, 453 



Wallace, A. R., on Lamarckism, 172 



Waltzing mice, 362 



Wart-hog, African, habits of, 180 



Weismann, on reversion, 122, 129, 

 140; on telegony, 148, 152 ; on 

 transmission of acquired charac- 

 ters, 168 ; on climatic influences, 



211 ; on Brown-Sequard's results, 

 233 ; theory of continuity of the 

 germ-plasm, 410, 419 ; summary, 

 434 ; germinal selection, 454 



Weismannism, Mendelism and, 366 



Weldon, Prof., on the law of ances- 

 tral inheritance, 320, 321, 328 



Westphal, 232 



Whitman, Prof. C. O., 398 



Wilder, H. H., 211 



Wilson, Dr. George, 271 



Wilson, Prof. E. B., on number of 

 chromosomes, 45, 46, 48, 50 ; on 

 amphimixis, 50 ; nuclear division, 



439, 49o, 494 

 Winkler, experiments of, 64 

 Wolff, C. F.,415 

 Wollaston, 23 

 " Wonder horses," 86 

 Wounds, 225 



Xenia, 159, 160 



Young birds, experiments with, 21 

 Yule, G. Udny, 15 ; on regression, 

 321 ; on Mendel's and Galton's 

 laws, 327 

 Yung, experiments on sex-deter- 

 mination, 482 



Zebra and horse, hybrids, 138 

 Ziegler, Prof. Ernst, on acquired 

 characters, 182, 259 ; trans- 

 missibility of nervous disorders, 

 282 

 — Prof, H. E., on chromosomes. 

 103, 300 ; dwindling of parts, 

 determination of sex, 487 



