HEEEDITY 



and were discharged, ample time, it would seem, 

 for the influence of a foreign body upon the 

 inheritance to show itself were such influence 

 possible. 



In the light of the three principles now 

 stated, viz. (1) the duplex condition of the 

 zygote, (2) the simplex condition of the 

 gametes, and (3) the distinctness of body and 

 germ-cells, we may proceed to discuss the 

 greatest single discovery ever made in the 

 field of heredity, Mendel's law. 



BIBLIOGKAPHY 



CASTLE, W. E., and PHILLIPS, JOHN C. 



1911. "On Germinal Transplantation in Vertebrates." 

 Carnegie Institution of Washington, Publication No. 

 144, 26 pp., 2 pi. 

 HEAPE, W. 



1890. "Preliminary Note on the Transplantation and 

 Growth of Mammalian Ova within a Uterine Foster- 

 mother.' 7 Proc. Roy. Soc., 48, pp. 457-458. 

 1897. "Further Note," etc. Id. 62, pp. 178-183. 

 WEISMANN, A. 



1893. "The Germ-Plasm." Translation by Parker and 

 Romfeldt. Chas. Scribner's Sons, New York. 



