278 NoH-I soluble Races. 



tion.-^ On this point the hterature is rich in contradictory 

 information. This contrachction is probably mainly due 

 to the fact already mentioned that the green parts are 

 so very much stronger than the variegated ones. This 

 strikes the eye so forcibly that the idea easily arises that 

 the strongest parts of the variegated plants are most liable 

 to become green and the weakest branches of green 

 plants most likely to become variegated. In my opinion, 

 however, this conclusion is incorrect. The relative vigor 

 is determined by the anomaly, but from this it by no 

 means follows that the anomaly, in its turn, is determined 

 by it. So far as my experience goes the reverse is the 

 case, and variegation forms no exception to the general 

 rule fur semi-latent characters, that favorable conditions 

 increase the intensity of the anomaly. 



The best instance that I know is furnished by the 

 variegated horse-radish (Cochlearia Aruioracca varie- 

 gafa), which with unfavorable treatment is almost green, 

 but under glass or in a cold frame may even become en- 

 tirely white. Plants growing in the open in a sunny posi- 

 tion are often beautifully variegated, wdiereas in shady 

 positions they are a much darker green. The same is 

 true according to Schlechtendahl of Plectogync I'arie- 

 (/afa on the leaves of which a greater or lesser number 

 of white stripes can be induced at will by merely trans- 

 planting* it.- Fragaria indica variegata is a favorite 

 plant for hanging-baskets. If one wishes it to be nicely 

 variegated it must be planted in good dry soil, not too 

 loamy or calcareous.'''' The same is true of the striped 

 sorts of the ordinary strawberries, in which, as Ver- 



' E. Laurent, Sur Voriginc des varictcs fanachecs. Bull. Soc. 

 R. Bot. Belgiquc, Vol. XXXIX, 1900, pp. 6-9. 



■ Bot. Zcitung, 1855, p. 558. 



^\^tlmorin-Andrieux,, Flrurs dc plcinc tcrrc, p. 408. 



