the Progress of English Agriculture. 853 = 557 
snption of different articles of food.* That is to say, in the 
t« of foods of high percentage of nitrogen, such as cakes and 
jlse, 10 per cent, of the total nitrogen of the food is deducted 
i increase in live weight and for some loss, and 90 per cent, 
i reckoned to be recovered in the manure; and in the case of 
fids of comparatively low percentage of nitrogen, such as the 
<-eal grains, 15 per cent, is deducted for increase and loss, and 
1 per cent, is estimated to go into the manure. Of the mineral 
cistituents, phosphoric acid, potass, 6cc., generally a consider- 
alyless proportion of the amount of them in the food than of 
tr nitrogen is deducted; but the deduction of a little more 
( a little less of these very immaterially affects the valuation of 
manure. 
The rotation adopted is the ordinary four-course — of roots, Rotation I 
Irley, seeds, and wheat. There are four kinds of manure to be adopted, 
f plied for the roots, as above described, to each of which 1 acre 
1 J been allotted. When the land is in seeds. Plot 1 will be fed by 
S!ep with a given amount of cotton-cake ; Plot 2 with the same 
2 cunt of maize-meal ; Plot 3 without purchased food ; but arti- 
fial manure, supplying the chief constituents estimated to be 
citained in the manure from the cotton-cake consumed on 
])t 1, will be applied to the succeeding wheat ; Plot 4 also will 
I fed without purchased food, but artificial manure, estimated 
t be equal to that from the maize-meal consumed, will be applied 
tthe succeeding wheat. 
Accordingly, 4 acres of barley grown in 1876, after spring 
t es fed once with cake, were sown with seeds; and 4 acres 
'•re sown with mangolds. The remaining portion of the field 
vs again sown with barlev, but manured with 7 cwt. of rape- 
(\e per acre ; 4 acres of it were sown with seeds to come under 
< periment next year ; and 4 more will be sown with roots, and 
ixt come under experiment nest year. Thus 8 acres came 
."to exact experiment this year (1877), and the remaining 8 
ill come in 1878. 
The following plan shows at one view the course of cropping 
' the 16 acres under rotation experiments : — 
Rotation, Xo. 1. 
* Acres. 
Rotation, No. 2. 
4 Acres. 
Rotation, No. 3. 
i Acres. \ 
Rotation, No. 4. | 
4 Acres. 
1877 
Seeds. 
i 
Eoots. 
fBarley, with 7 cwt. Rape-I ! 
\ cake per acre. /, 
1878 
1879 
1880 
1881 ' 
Wheat 
Roots. 
Barley. 
Barley. 
Seeds. 
Wheat. 
Seeds. 
Wheat. 
Eoots. 
Barley. 
Eoots. 1 
Barley. 
1 Seeds. 
1 Wheat, i 
'Journal of the Eoyal Agricultural Society of England,' vol. xi., s.s., Part I. 
