BOTANICAL CHARACTERS. 335 



and sow them for a few years successively, in a soil as 

 poor as that in which the wild stock may be found grow- 

 ing, we should see them gradually recede to their original 

 state, and in the course of a few years, the fully-developed 

 and weighty bulb would have entirely disappeared, and 

 left only the long, tough, stringy root, characteristic of 

 the original prototype. (See page 317.) Again, in the 

 turnip the increase of leaf is considerable; but this is 

 better seen in the different varieties of the cabbage, where 

 it is not accompanied by increase in the root. In the 

 rape and colza, the stem especially, and the leaves show 

 the peculiar development. In the cauliflower and the 

 broccoli, 1 the tendency to increase is exhibited in the 

 flower -stalks; in the sea- kale, the leaf -stalks them- 



KOHL-RABI Round or Globe Variety. 



selves receive the increase of deposited matter. The 

 "kohl-rabi," which we have now to consider, exhibits 



1 A remarkable instance of this tendency to depart from the ordinary type 



