CHAP. VI.] THE kitchen-garden. 155 
ishment, and thus preventing it from being 
driven to the necessity of taking unwhole¬ 
some food. In fixing the rotation of crops, 
plants differing as much as possible in their 
habits should be chosen to succeed each 
other; as, for example, onions may be suc¬ 
ceeded by lettuces; carrots by peas; potatoes 
by cabbage ; turnips by spinach, &c. 
The Cabbage Tribe .—Few persons unac¬ 
quainted with botany will be able to believe 
that brocoli, cauliflowers, cabbages, Scotch 
or German Greens, Brussels sprouts and 
savoys, not only all belong to one genus, but 
are actually varieties of one species of a 
genus, viz. Brassica oleracea; and that the 
turnip, the Swedish turnip, and the rape (the 
seed of which is used for oil), belong to other 
species of the same genus. The cabbage, in 
its wild state, is a biennial which grows 
naturally on the sea-coast in different parts 
of England, and is a tall straggling plant 
with loose leaves, and a rather pretty yellow 
cruciferous flower. The borecole or kale is 
the first improvement effected by cultivation; 
and the cauliflower the last. Indeed it is 
impossible to imagine a greater difference 
