Striped Flowers 325 



stances, where secondary sexual marks, which 

 are as a rule only evolved by one sex, are trans- 

 ferred to the offspring through the other. 



Stripes are by no means limited to flowers. 

 They may affect the whole foliage, or the fruits 

 and the seeds, and even the roots. But all such 

 cases occur much more rarely than the striped 

 flowers. An interesting instance of striped 

 roots is afforded by radishes. White and red 

 varieties of different shapes are cultivated. 

 Besides them sometimes a curious motley sort 

 may be seen in the markets, which is white with 

 red spots, which are few and narrow in some 

 samples, and more numerous and broader in 

 others. But what is very peculiar and striking 

 is the circumstance, that these stripes do not 

 extend in a longitudinal, but in a transverse 

 direction. Obviously this must be the effect of 

 the very notable growth in thickness. Assum- 

 ing that the colored regions were small in 

 the beginning, they must have been drawn out 

 during the process of thickening of the root, and 

 changed into transverse lines. Rarely a streak 

 may have had its greatest extension in a trans- 

 verse direction from the beginning, in which 

 case it would only be broadened and not defi- 

 nitely changed in its direction. 



This variety being a very fine one, and more 

 agreeable to the eye than the uniform colors, is 



