ANTHOCYANINS AND GENETICS 193 



definite cultures were made with Antirrhinum majus luteum rubro- 

 striatum. In Antirrhinum (see p. 160) the flower may be ivory striped 

 with magenta anthocyanin, or yellow striped with crimson, this latter 

 colour being merely magenta superposed upon yellow ; the yellow 

 pigment (luteolin) does not show striping. In the offspring of de Vries' 

 plant, which was yellow striped with crimson, there were no pure 

 yellows, though all grades of striping were found, ranging from yellow, 

 with a few of the finest stripes, through intermediates, to those with 

 the broadest stripes, or even whole sections of red ; and with these 

 occurred a certain number of pure red flowers. The red flowers will 

 appear suddenly as a sport (though without graduated links with striped 

 forms) among the striped individuals, and conversely, the striped 

 flowers will appear among the offspring of the self-form. Thus red 

 can be obtained from striped, and striped from red, and both variations 

 can be obtained by seed ; but de Vries noted bud-variations and varia- 

 tions within the spike, only in striped individuals, though he is of the 

 opinion that they might be found on red plants if sufficiently large 

 numbers of individuals were dealt with. 



The following table 1 represents the successive families obtained 

 by de Vries from one striped plant: 



Striped plant ... ... ... ... P! 



F a 



So far then de Vries expresses the facts of inheritance of striping 

 thus: 



1. The striped race is an inconstant one and consists of striped and 

 red-flowered plants. 



2. Striping itself varies continuously, but there is discontinuity 

 between the striped and red forms. 



3. The intensity of inheritance of finely striped plants is about 



1 See also Emerson (605) 



w. P. 13 



