CASE OF THE ANDALUSIAN FOWL 35 



the hybrid tall pea, and that the two forms which 

 correspond to the pure tall and pure dwarf in the 

 peas are the black and white birds respectively. Or, 

 rather, this case more closely resembles that of the 

 texture of the pods in the pea where, it will be remem- 

 bered, the result of crossing a hard-podded with a 

 soft-podded pea was a pea whose pods were inter- 

 mediate in texture — between those of its two parents, 

 but closer to those of the former. 



Be this as it may, the result of crossing a black 

 and a white is a blue Andalusian, and blue birds 

 obtained in this way, when mated together, produce 

 a generation of fowls consisting of about one black, 

 two blues, and one white in every four. 



The Mendelian phenomenon exhibited by these 

 fowls may be set forth in the form of a genealogical 

 table (Fig. 14) corresponding to that representing 

 the result of crossing a tall with a dwarf pea. A 

 comparison between the table of the fowls and that 

 of the peas brings out one important point of differ- 

 ence between them. In the case of the peas, the 

 hybrid tall, whether it occurs in the first or second 

 hybrid generation, only differs from the pure tall 

 by its breeding properties and not by any outward 

 characteristics of its own — or, more strictly, not by 

 any characteristics of its own so far as we know at 

 present. It is not improbable that accurate measure- 

 ment may reveal a difference. For the present, 

 however, at any rate, the hybrid tall and pure tall 

 are identical so far as we know them, except in 

 their breeding properties. In other words, the tall 



