278 Non-Isolablc Races. 

tion. 1 On this point the literature is rich in contradictory 
information. This contradiction 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 for 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 Arnwracea varie- 
gata), 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, whereas in shady 
positions they are a much darker green. The same is 
true according to SCHLECHTENDAHL of Plectog\nc I'aric- 
yata on the leaves of which a greater or lesser number 
of white stripes can be induced at will by merely trans- 
planting it. 2 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. 3 The same is true of the striped 
sorts of the ordinary strawberries, in which, as VER- 
1 E. LAURENT, Sur 1'origine des varictes panacliccs. Bull. Soc. 
R. Bot. Belgique, Vol. XXXIX, 1900, pp. 6-9. 
-Bot. Zcituug, 1855, P- 558. 
3 VILMORIN-ANDRIEUX, Flcitrs dc plcinc Icrrc, p. 408. 
