448 
Experiments on the Feeding of Stock. 
as !M. Boussingault named it), and the excess of nitrogen in the 
secretions (probably in the urine) which anv derangement in 
health occasions. The whole trial is divided into four periods : 
the first, of 41 davs, represents failure ; the second (o2 days) 
the rally : the third (72 days) continuous progress ; the fourth 
C18 days in May) gave a hint to conclude. After the first period 
the third sheep was drafted, being sick and maltreated by the 
others. 
In the third period, the course of events was uniform and 
steady ; it therefore offers the surest basis for general conclusions. 
The two sheep ate regularly per day of steamed mangolds at 
first 9 lbs., but soon 11 lbs.; bran 22 lbs.: oats 2'2 lbs.; 
of straw-chaff a ration, which decreased from If lb. to 1 lb. as 
the weather grew warmer. The average of food taken per head 
per dav was — 
lbs. 
Mangold steamed o"36 
Oats 1-10 
Bran 108 
Straw ; .. .. -58 
In all S12 
The increase in live-welsht, ascertained every week, was 
steadv : thev never went back. In some weeks there was an 
apparent gain of 4 lbs. per head ; in a few others no apparent 
gain : but the varving state of the bowels might account tor such 
fluctuations consistently with steady improvement. The entire 
gain in live-weight amounted — 
Ibi. 
In one sheep, to -4'2 
In the other IT'G 
41-8 
Average -0"9 
or more than 2 lbs. per week. 
The amount of the mixed manures collected daily averaged 
5 23 lbs. per head, and contained •0332 of a pound of nitrogen. It 
was valued at l<f."87 per day, the nitrogen being set at nearly 6ff. 
per lb., and no account taken of other constituents, which probably 
bore nearly a constant ratio to the nitrogen. 
We now come to the points to be specially determined in this 
trial, which it will be well to state in some detail. 
The amount of nitrojen in the food was thus determined. 
The nitrogen in the mangold was set at 0"160 per cent This 
was the mean of all the analyses, of which two were taken in 
December, seven in January, and five in February. 
