310 DAVENPORT. 



Thus the first class has 6.25^0 purely dominant in both charac- 

 ters; the second class, 12.5^ purely dominant in one character 

 and hybrid in the other, and so on. Recalling that hybrid 

 zygotes produce somas with the dominant character, it follows 

 that the progeny appear as follows : 



A. dom. + B. rec 18.75% 



A. rec. + B. dom 18.75% 



A. dom. + B. dom 56.25% 



A. rec. + B. rec 6.25% 



A result which again agrees with experiment. The resulting 

 mixtures of characters in tri to polyhybrids may be likewise 

 predicted, by extending the principles already laid down. 



BIBLIOGRAPHY. 



1900 CORRENS, C. G. Mendel's Regel iiber das Verhalten der Nachkom- 



menschaft der Rassenbastarde. Berichte der dentscJien Botanischai 



Gesellschaft. XVIII. Jahrgang. Heft 4, pp. 158-168. May 23, 



1900. 

 1900 DE VRIES, H. Sur la loi de disjunction des hybrides. Comptes 



Rendus de VAcad. des Sciences. Paris. March 26, 1900. 

 1900b DE VRIES, H. Das Spaltungsgestz der Bastarde. Berichte der 



deutschen Botanischen Gesellschaft. XVIII. Jahrgang. Heft 3. 



pp. 83-90. April 25, 1900. 

 1900c DE VRIES, H. Sur les unites des caracteres specifiques et leur 



application a 1'etude des hybrides. Reinie generale de Botanique. 



XII. pp. 257-271. July 15, 1900. 

 1889 GALTON, F. Natural Inheritance. New York. Macmillan & Co. 



pp. 259. 

 1865 MENDEL, G. Versuche iiber Pflanzenhybriden. Verh. des A'atttr- 



forscher- Vereins in Briinn. Bd. iv, p. i . 



