244 Report of the Field and Feeding Experiments 
1000 lbs. maize-meal in addition ; the third and fourth acres 
each with dung from the same amount of litter, and of mangolds 
and wheat-straw chaff as food, without any purchased food in 
addition ; but one of them received artificial manure, supplying 
two-thirds as much nitrogen and as much of the other con- 
stituents as were estimated to be contained in the manure from 
the 1000 lbs. of cotton-cake ; and the other received artificial 
manure supplying the whole of the nitrogen, and other con- 
stituents, estimated to be contained in the manure from the 
1000 lbs. maize-meal. 
The amounts of produce obtained are recorded in the following 
table : — 
MancxOlds, 1877. 
With Dung, made from 3230 lbs. Straw, as litter;! 
5000 lbs. Mangolds, 1250 lbs. Wheat-straw Chaff, [ 
and 1000 lbs. Cotton-cake 
With Dung, made from 3230 lbs. Straw, as litter ; 
5000 lbs. Mangolds, 1250 lbs. Wheat-straw Chaff, 
and 1000 lbs. Maize-meal 
With Dung, made from 3230 lbs. Straw, as litter ;^ 
5U00 lbs. Mangolds, 1250 lbs. Wheat-straw Chaff; 
and Artificial Manure, containing two-thirds as 
much Nitrogen, and the other constituents, of the 
Manure from 1000 lbs. Cotton-cake ; namely, 
248 lbs. Nitrate Soda, 100 lbs. Bone-ash (made 
into Superphosphate), 62J lbs. Sulphate Potass, 
and 65 lbs. Sulphate Magnesia 
With Dung, made from 3230 lbs. Straw, as litter ; 
5000 lbs. Mangolds, 1250 lbs. Wheat-straw Chaff; 
and Artificial Manure, containing as mucli Nitro- 
gen, and other constituents, as the Manure from) 
1000 lbs. Maize-meal ; namely, 80 lbs. Nitrate 
Soda, 16J lbs. Bone-ash (made into Superphos- 
phate), 7 lbs. Sulphate Potass, and 11 lbs. Suli)hato 
Magnesia 
tons. cwts. 
3 17 
2 11 
tons. cwts. 
2 15 
1 ICa 
3 8i 
3 16J I 2 11§ 
As compared with ordinary agricultural crops, these weights 
are but small. The quantity of dung applied was, however, only 
from 3 to 4 tons per acre ; whereas in ordinary farming 20 or 
even 30 tons are often applied for this crop. The following 
considerations will show why this could not be done in these 
experiments. The object of the VVoburn Rotation experiments 
is to measure the effects, througliout the course, of the manure 
produced by the consumption of a given quantity of one cattle- 
food, against those of the manure from an equal quantity of 
another food ; and at the same time to compare these with 
