Agricultural Chemistry. 
dergone, is precisely that which all experience shows (and we 
have perhaps opportunities of information on this point second 
to none) to be the cliaracteristic exhaustion induced by the 
growth of grain in an ordinary course of rotation with insufficient 
home-manuring. Upon the truth of this statement, which no 
results of direct experiments on individual soils would, we sup- 
pose, be admitted to substantiate, we are content to rest the 
credit and validity of our conclusions generally. More than 
this, however, is insinuated by Baron Liebig, — namely, that we 
would recommend the application of ammonia-salts alone, on 
all soils, and for the continuous growth of corn as an agricultural 
practice •.— This we have never done* 
Some of the results in Table IV. will, however, distinctly 
show, that the " recipe," as Baron Liebig calls it, to which we 
come, is not only applicable to our " own lands, and to them 
only in so far as experimented on," but that this so-called 
" recipe " is applicable to " other land of different quality ". 
Thus, under the head of loheat, we have in the Table the results 
obtained by the use of ammonia-salts, both used alone and with 
a full supply of minerals, not only on our own land, but on 
that of the Duke of Bedford at Woburn, and of the Earl of 
Leicester at Holkham ; and, as will be seen by the description 
given below, the character of the soil in these two cases differed 
very widely, both from each other, and from our own. In some 
particulars, indeed, especially at Woburn, the description of land 
is such, that if it were possible to get from any ordinary culti- 
vated soil, a result inconsistent in the main with our own, we 
should, according to the notions of Baron Liebig, be led to anti- 
cipate that it would be here most manifest. 
The soil upon which the experiments at Holkham were made 
is described by Mr. Keary, as a " light, thin, and rather shallow 
brown sand-loam," but " resting upon an excellent marl, which 
contains a large quantity of calcareous matter." Mr. Keary adds, 
that he finds these light sand-loams, icith the above subsoil, " to 
be most productive and grateful for liigh^farming.'^ 
Mr. Baker describes the land allotted to the experiments at 
Woburn as follows : — 
" The land these experiments are upon is what I consider a very poor 
description of sand, on a particularly wild sandy subsoil. . . . The land 
has been farmed on the four-course system, I think I may say for twenty-five 
years, and previous to that was open heath-land. This, as yow are aware, is 
the fifth season the plots have had wheat vpon them in succession." 
Now, if it were possible to find a soil under ordinary culti- 
vation, which, according to the suppositions of Baron Liebig, 
* On this point, see Eeport of Experiments on the Continuous Growth of Wheat 
at Holkham Park Farm, in the last number of this Journal. 
