134 



Experimental Zoology 



Aside from the details of Davenport's work, his chief results 

 consist in showing that in nearly all characters examined the 

 influence of the recessive character is to be seen in the first hy- 

 brids, and even in the second hybrids, so far as obtained, the 



FIG. 14. Single-comb White Leghorn, male, Fig I ; rumpless Game male, 

 Fig. 2 ; hybrid, FI, between last two races, Fig. 3. 



impurity of the offspring is often apparent. As yet in only 

 a few cases have the experiments been carried to the second 

 generation. The results are evidently complicated by the im- 

 purity of some of the strains that were used and by the presence 



