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THE AMERICAN NATURALIST [Vol. XLIV 



reoxidizes X with atmospheric oxygen; C is a chromogen, the 

 oxidation of which, by the combined action of A, X and P, 

 gives anthocyanin. Additional factors, A 2 , X 2 and P 2 , similar 

 in a general way to A, X and P, convert red into bluish-red and 

 purple. Chemical tests indicate a shortage and not always 

 entire absence of some of the above factors in white varieties. 

 This bit of information is important in connection with the tele- 

 one theory recently proposed by the Avriter in an article in the 

 American Naturalist, and accords with that theory. 



Baur has recently published an extremely interesting report 

 on his study of inheritance in Antirrhinum. 1 He gives some 

 interesting details of methods with special reference to the 

 avoidance of error in experimental work of this kind. He has 

 found 22 unit characters, but deals with only 13 in this paper. 

 Baur recognizes the following colors in Antirrhinum: 



White = Miss Wheldale's white. 



Yellow = Miss Wheldale's yellow. 



Elf enbein =s Miss Weldale's ivory. This differs from white by the 

 presence of a pale-yellow chromogen, according to Miss Wheldale. 



The last six are superposed on yellow or ivory, and each of them 

 may appear whole or as delilahs— that is, on lips only. The 

 colors chamois-rose, red, dark red and rubin may also be striped 

 (picturatum). 



Baur recognizes the following color factors: 



B (=Miss Wheldale's Y) is the basis of color. 



bb is pure white, distinguished from ivory by absence of yellow in the 



C in the absence of P (see below) converts B into elfenbein (ivory), 

 and hence = Miss Wheldale's J. 



F in the absence of E (see below) and in the presence of B causes a 



R with B and F gives flesh-color; but without B and F, R gives no effect. 

 M in the absence of A and the presence of B, F and R gives chamois-rose. 



A in the presence of B, F, R and M gives red. 

 L in the presence of B, F, R, M and A, gives dark red. In the series 

 of factors BFRMAL, each factor is dependent on all before it. 



