120 s. iKENO : 



will simply compare the results of the crosses of tlu'ee kinds of white by 

 orange : — 



1. Orange x wliile-I 



2. .. .. . II 



3. .. ., .. Ill 



F> 



Orange 



Mngen*a 



Ornncre 



F-, 



3 oranges : 1 white. (Cross I). 



9 magentas : 3 oranges : 4 whites. (Cross TI) 



9 oranges : 3 pseudo-whites : i whites 



Colours of Vegetative Organs and 

 Floral Parts. 



In ;iU ViTiieties of Portulaca the colom- of vegetative organs, as stems 

 and leaves on the one hand, and that of floral parts, as petals, i51aments, 

 styles, stigmas on tjie other, are intimately con-elated to each other. In 

 white-I stems, leaves, and styles are green ; and petals, filaments, styles, and 

 stigmas are wliite. In wliite-II stems and leaves are gi-een, and whilst 

 filaments, styles, stigmas, and petals are also white, ^Detals have sometimes a 

 few broad or narrow magenta stripes or spots, and there may be few magenta 

 filaments mingled with wlnie ones. In all colom'ed varieties stems and leaves 

 are reddish gi-een ; filaments and styles are red or mttgenta, and so are also 

 stigmas, though less intensely than in the latter. Ovaries ai-e gi-een, because 

 their wall contains chloroplasts, and in colom'ed varieties they ai-e somewhat 

 redthsh, lint so slightly as to easily escape the notice of ciisual observeis. 

 When a colom-ed flower is produced on a wliite plant {hul-mvtaiion) the 

 branclilet bearing such a flower as well as leaves on it ai-e more or less 

 redchsh, whilst other branchlets remain gi-een. The pseudo-white race seems 

 to deviate from this nüe, because while leaves and stems ai-e i-eddish, the 

 corolla is white, but in retdity the latter is not perfectly white, being tinged 

 with magenta. 



From the fac-ts above given we may conclude that the factor C either 

 alone or in conjimcticm with jB (with or without B) is able to give colour 

 to stems, leaves, petals, filaments, styles and stigmas. In white-II B and B 

 ai-e unaccompanied by C, and consequently are able to give colom-, neither to 

 stems and leaves, nor to petals, filaments, styles and stigmas, but sometimes 



