488 THE AMERICAN NATURALIST [Vol. XLTV 



It will be observed that in this table the "heterozygous 

 female" is GX. She is therefore not heterozygous for 

 tactical or unless Indicator is absence of G. 



The case of A hra ras finds a parallel in three charac- 

 ters in fowls and one in canaries. 



The pink eyed cinnamon canary crossed with the black 

 eyed green canary gives the following results: 



P.? X B. = 100 per cent. Black eyed # + 9, 

 B.?xP.t? = 50 per cent. Black eyed <? + 50 per cent. 

 Pink eyed ? + 4 per cent, black eyed $. 



Analysis shows (if we reject the 4 per cent, unex- 

 plained anomaly), that the facts can be explained in the 

 same way as in Abraxas. 



The barred condition of the feathers of Plymouth Kock 

 fowls is inherited in the same way as the next table -how s 

 when crossed with Langshan. 



Ply. $ X Lang. <$ = 50 per cent. Ply. J + 50 per cent. 

 Lang. $, 



Lang. ? X Ply. $ = 100 per cent. <$ and $. 



There are two varieties of Game Bantams which ac- 

 cording to Hagerdoorn give similar results. 



Bankiva $ X Brown red^=50 per cent. Bankiva c? + 



50 per cent. Brown red $, 

 Brown red $ X Bank. <? = 1 00 per cent. Bankiva J and ?. 



Finally yellow shanks and blue shanks in fowls are in- 

 herited apparently in like fashion. 



Yellow $ X Black <$ = 100 per cent. Yellow <$ and $, 

 Black $ x Yellow <? = 50 per cent. Yellow $ + 50 per 

 cent. Black J\ 



show that certain characters behave in certain ways that 

 can be explained on the Mendelian formula? provided 

 that sex is likewise treated in the same way. 



It may seem unfortunate that we have so many pos- 



