58 DARWINISM TO-DAY. 



a means of introduction to the subject, not alone in its broad out- 

 lines, but in its extensive ramifications of relation to other evolution 

 problems. Some of these books and papers include extended biblio- 

 graphic lists sufficient to enable one to follow up the subject in any 

 of its special phases. 



Darwin, Chas., "The Origin of Species," 1859. 



Darwin, Chas., "The Variation of Animals and Plants under 

 Domestication" (Amer. ed.), 1868. 



Wallace, A. R., "Darwinism," chaps, iii and iv, 1891. 



Allen, J. A., "On the Mammals and Winter Birds of East Florida," 

 Bull Mus. Comp. Zool, II, pp. 161-450, Plates IV- VIII, 1871. 



Galton, R, "Natural Inheritance," 1889. 



Bateson, W., "Materials for the Study of Variation," 1894. 



Duncker, G., "Die Methode der Variationsstatistik," Archlv f. 

 Entwick. Mech., Vol. VIII, pp. 112-183, 1899. (Full bibliography.) 



Rosa, D., "La riduzione progressiva della variabilita i suoi rap- 

 porti coll' esstinzione e coll' origine delle specie," 1899. 



Conn, H. W., "The Method of Evolution," chap, iv, 1900. 



Davenport, C. B., "A History of the Development of the Quan- 

 titative Study of Variation," Science, N. S., Vol. XII, pp. 864-870, 

 1900. 



De Vries, H., "Die Mutationstheorie," Vol. I, pp. 7-150, pp. 

 412-648, 1901. 



Ewart, J. C., "Variation; Germinal and Environmental," Trans. 

 Roy. Dublin Soc., Ser. II, Vol. VII, pp. 353-378, 1901. 



Vernon, H. M., "Variation in Animals and Plants," 1903. 



Delage, Y., "L'Heredite," pp. 283-310, pp. 826-843, 2d ed., 1903. 



Davenport, C. B., "Statistical Methods in the Study of Varia- 

 tion," 2d ed., 1904. (Full bibliography.) 



Kellogg and Bell, "Studies of Variation in Insects," Proc. 

 Wash. Acad. Sci., Vol. VI, pp. 203-332, 1904. 



Lotsy, J. P., "Vorlesungen iiber Descendenztheorien," Vol. I, 

 chap, ix, 1906. 



Biometrika, 1901-1906. A journal devoted chiefly to the sta- 

 tistical study of variation. 



7 See Kellogg, "Variation in Parthenogenetic Insects," Science, 

 N. S., Vol. XXIV, pp, 695-699, 1906, in which it is shown that the 



Oases of marked parthenogenetically produced drone honey-bees vary 

 variation in par- much more than do the workers which are of bi- 

 thenogenetic ani- sexual parentage, and that parthenogenetically pro- 

 mals> duced plant-lice (Aphidids) vary as markedly as 



insects of bisexual parentage. See also Warren, Proc. Roy. Soc., 

 Vol. LXV, 1899. in which the variation in parthenogenetic varia- 

 tions of Daphnia magna is shown to be little, if any, smaller than 



