ACCLIMATATION. 27 
distinguished from the charlton, a later kind, or second early, 
and repeated generations add to the length of the straw. 
In the case of early cabbage, imported from the South to 
the North, and grown for seed, the early quality disappears to 
some extent in the first generation, and the cabbage becomes 
larger in size, so that to raise the early York variety, from 
seed, it is necessary to plant the early May or dwarf. Late- 
ness is accompanied with hardiness in this plant. 
In the case of turnip imported to the North they are apt 
to lose their early ripening qualities, and to grow larger, and 
later into the end of the season. This is a valuable quality 
in the brassica tribe. It has the singular and valuable pro- 
perty of giving hardiness to the esculent, enabling it to with- 
stand the severity of winter better than those of earlier matu- 
rity, which are more subject to frost. 
Thus the Aberdeen yellow bullock turnip takes the first 
place in the list of the British agriculturist,—Aberdeen being 
the depdt for the seeds saved in the cool and elevated districts 
throughout the north of Scotland. Now though we look in 
vain for any acclimatizing influence imparted to resist frost in 
annual crops, yet, in these biennials, the cabbage and turnip, 
we think we can perceive distinctly enough, in a generation 
or two, the power of the plants to adapt themselves to the 
climate they occupy. The bringing forward of our remarks 
on these plants may appear a digression from the object of 
this work, but they have been referred to for the purpose of 
showing that little can be expected to be done in acclimatizing 
a plant that is an annual, and has no existence during the 
months of winter, and that biennials are the shortest-lived 
plants that can be expected to be inured to a low tempera- 
ture. 
It is pretty well understood that the purple laburnum (C. 
Adami) is a hybrid between the common Scotch laburnum 
and the dwarf, shrubby, purple cytisus (C. purpureus). The 
original was produced in France. It is propagated by being 
worked on the stock of any laburnum; as being a mule, it 
(the purple laburnum) does not produce seed; but the tree 
