410 THE AMERICAN NATURALIST [Vol. XLIX 



These cases may be given. Two kinds of crosses are ex- 

 pected. In a few cases the normal will be found to be a 

 true normal (single cross-overs) and give therefore only- 

 normal offspring when bred to normal (recessive). In 

 other cases the expectation is for abnormal offspring, 

 and where change of type has been extensive, these kinds 

 will be in the majority. 



In experiment II, 2 one gray red normal female when 

 tested gave GEAb c? and $. 



In experiment I, seven GBN 2 were bred to BWN 

 Four gave some abnormal offspring and three gave only 

 normal offspring. 



In experiment I 3 five GEN 2 were tested. Three gave 

 some abnormal, two gave only normal offspring. 



In experiment H 5 seven GEN 2 were tested. Four 

 gave some abnormal offspring, and three gave only nor- 

 mal offspring. 



In experiment IIIj one GEN 2 tested gave some ab- 

 normals. 



In m 2 one GEN 2 bred to YEN <$ gave some GEAb S$ 

 and ??. 



In III 5 some BEN £ were bred to their BEN sisters. 

 All BE offspring were abnormal. 



In III n GEN 2 paired to GEN <? gave GEAb J and ?. 



In III 20 GEN 2 bred to GWN brothers gave GEAb 2 

 and GWAb 6* and ?. 



In III 35 GEN to GEN <? gave GEAb <? and ?. 



In III 35 GEN ? bv GWN <? gave GEAb ? and GWAb <$ 

 and % 



In m 42 GEN ? by GWN $ gave GEAb $ and GWAb $ 

 and ?. 



In in 84 GEN $ (17) by GWN <$ (4) gave the same re- 

 sults as the last. 



In III 58 GEN $ X YWAb $ gave GEAb £ and $. 



In III r>8 GEN ? to GWN $ gave GEAb $ and 2 and 

 YWAb <? and ?. 



In m 79 GEN $ to GWN $ gave GEAb 2 and GWAb <T 

 and 2 in three different tests. 



