No. 614] 



THE BLUE ANDALUSIAN 



113 



White Wyandotte ^ X blue-splashed Andalusian ?. 



F 2 PpRE = all blue; 



F 2 6 blues : 3 blue-splashed : 3 black : 4 white. 

 2PPRE 1PPRR 1PPEE 1 ppRR 



4PpRE 2 PpRR 2PpEE 2 ppRE 



1 ppEE 



This same ratio (6:3:3:4), which is to be expected on 

 either interpretation, has been reported by Baur (1914, 

 p. 95) for crosses between a white-flowered race and cer- 

 tain plants bearing ivory-colored flowers, of the snap- 

 dragon (Antirrhinum ma jus). 



Recessive mutations are of comparatively frequent oc- 

 currence. Dominant mutations, though much less fre- 

 quent, have been described so often that they can not be 

 reasonably doubted. There appears to be no reason, a 

 priori, why a mutation might not occur where the mutated 

 factors ' potency of expression in the phenotype is approxi- 

 mately equal to that of the normal factor. That this has 

 occurred, not once, but several times, might be the inter- 

 pretation placed on the striking allelomorphic series re- 

 ported by Nabours (1914, p. 141) for the color patterns 

 of the grouse locust (Paratettix). 



Upon which of the two alternative interpretations is 

 correct appears to depend the possible success or the futil- 

 ity of the search for true breeding blues. The first makes 

 it possible. The second appears to close the door of hope 

 in the Andalusian breeder's face unless hope is seen in 

 the progressive selection of the darker blue-splashed in- 

 dividuals. It does not appear possible, on the basis of 

 present known facts, to reach a conclusion. Extensive 

 matings are being made for the coming breeding season 

 which it is hoped will throw further light on the matter. 



Summary 



1. This paper shows that blue Andalusians are like 

 black Andalusians in that they are self-colored. They 



