ANTHOCYANINS AND GENETICS 159 



the results of crossings with this variety are not given, though it was 

 shown to be recessive to magenta. 



Rose, which has the lips of the corolla tinged with magenta and a 

 pale magenta tube, was identified with de Vries' fleischfarbig ; magenta 

 with rot, delila with magenta delila, and weiss with ivory. 



Hence de Vries' results may be expressed: 



magenta ivory 



YYIIR1R1LLTT { YYIIrlrllltt (where Rl = rose colour in 

 Fj magenta the lips). 



I 



magenta 

 magenta delila 



F 



2- 



rose 



rose delila I De Vries' 'whites.' 



ivory 



Since magenta is dominant to rose, and the tube of the corolla 

 always takes the same depth of colour as the lips, rose x magenta 

 delila would give magenta which would also corroborate de Vries' 

 suggestion that rot consists of fleischfarbig and delila. 



In 1908 Baur (517) published some results of his work on the same 

 species. He worked with magenta (rot), ivory (elfenbein), yellow and 

 white, and his results are entirely in agreement with those published 

 by the author in 1907. 



In 1909 the author (535) published further work and certain additional 

 results of which the most important are as follows: 



'Rose' is now termed 'tinged ivory,' and the factors L and T repre- 

 sent tingeing in lip and tube respectively. 



D is used to denote a deepening, or full-colour, factor which converts 

 tinged ivory into magenta. 



It was found that zygotes heterozygous for L in the presence of D 

 are pale magenta in colour, whereas those homozygous for L are inter- 

 mediate magenta. The colour remains unaltered whether the plant 

 be homo- or heterozygous for D. 



Sometimes the deeper colour occurs only in streaks and blotchings 

 when S may be substituted for D. When the zygote is heterozygous 

 for L, the streaks are pale magenta; when homozygous for L, inter- 

 mediate magenta. In non-striped forms, as mentioned above, the 

 flower-colour is the same whether the zygote is homo- or heterozygous 

 in D. But striped forms, heterozygous in S, have magenta stripings 



