ADDENDA. 
Hed Clover is the foundation of the alternate system of husbandry, and tliere 
is no sacrifice that ought not to be made to secure a large crop. That land grows 
"tired," or is "sick" of clover, is one of the many traditions which the farmer has 
from his forefathers. One farmer will say that he can grow it every sixth or 
seventh year, and some that it can be only grown every twentieth year, while 
another will say that he can get good crops of white, with a mixture of red, every 
fourth year. These opinions are sufficient to show that red clover is never a 
certain crop, and the reason why it is so I shall beg leave to explain more fully. 
It is, as has been said in the report, always weakened and killed by the frost, and 
this more on some soils than others. The red clover (trifolium pratense) is a 
native (indigenus) of Britain, and is ki:)own to botanists only as a perennial ; as a 
biennial it is unknown to them. The clover-seed used in this country is imported 
from France, or is raised from seed that was imported the year previously ; and 
plants which are transported from a warmer to a colder climate, do not immedi- 
ately accommodate themselves to the opposite conditions of the seasons in which 
they are placed, but for a while continue to show symptoms of flowering, at the 
same period of the year in which they had been accustomed so to do in their last 
native climate. Professor Henslow says that in some instances they are several 
years in accomplishing the change, and sometimes even die without effecting it. 
And it is in attempting thus to acclimate itself, that the stems of red clover 
through the autumn and winter are putting forth fresh leaflets, which as rapidly 
are cut off by the frost, until the " leaders" accompanying the floret are destroyed, 
and then the whole plant perishes. In this progress of acclimation or naturaliza- 
tion, the red clover becomes converted from a perennial to an annual on some 
soils, a biennial on others, and that most generally, — and upon some chalk soils, 
into a triennial plant. The native red clover, found in the vale of Aylesbury, 
and in Lincolnshire between Wainfieet and Skegness, does not push forth leaves 
except at the time in spring when all perennials begin to vegetate ; and if seeds 
were collected from the places mentioned, of the perennial red clover already 
naturalised, and which in all its botanical characters is identical with the cultivated 
red clover, it would no doubt endure the rigour of the winter, and grow^ luxu- 
riantly on lands adapted to its cultivation. 
It is a question of considerable importance to learn how long the plants of the 
true perennial red clover would remain permanent without degenerating, and 
upon what particular soils, — whether on calcareous, or only on those adapted to 
the superior perennial grasses. 
p. 223. Kimmeridge Clay from Elloughton Dale — specific gravity 2,100. 
p. 242. In a large field of red clover on the Wolds, near Riplingham, we saw 
the headland which formed a passage to other fields, and which was well trodden 
and carted over, much superior to the rest of the field ; the remainder being 
very thin of plants, which had also disappeared in circular patches. 
ERRATA. 
p. 226. For " Bath Agricultural Transactions," read " Bath Philosophical 
Transactions." 
p 234. For "humic acid, or 57 per cent.," read " humic acid at 57 per 
cent." 
p. 246. For " cleared for turnips," read " cleaned for turnips." 
