308 
French Experimental Farm at Vaujours. 
tainty, it was submitted to M. Houzeau for analysis, when the 
mistake was discovered, but could not easily be rectified. The 
analysis was as follows : — 
Analysis of Manure made hy Slieep icintered upon Hay, and littered icith 
Straw ill a Yard. 
Organic matter and ammoniacal salts 28"9G0 
Carbonic acid of combination 0'512 
Phosphoric acid 1"285 
Sulphuric acid 1'277 
Chlorine 0-916 
Potassium 0"G11 
Sodium 1-222 
Ma2;nesia and oxide of iron 0-256 
Lime 2-087 
Clay, sand, and soluble silica 12-194 
Water 50-680 
100-000 
Nitrogen, as carbonate of ammonia '072 
„ iu other salts -201 
„ in organic matter '922 
,, in nitrates traces 
1 • 195 
The small amount of water (50 per cent., instead of 75-80) and 
the large proportion of nitrogen (1*195, instead of 0-400) which 
this manure contained, quite deranged the intended balance be- 
tween the experimental manures. Since the " soil " contained of 
nitrogen 0*350 per cent., and of minerals and salts left after com- 
bustion 0-843 per cent., it had been intended that a dressing of 
24 tons per acre of yard manure, and the same number of tons of 
soil, should be applied. When the result of the analysis became 
known, to make up for the existing inequality, a farther supply 
of 24 tons per acre of sewage, diluted with an equal bulk of 
water, was applied as a top-dressing to the growing crop. The 
result was not so favourable as the manager anticipated, but it 
perhaps did all that he had any right to expect from this over- 
dose. But even then more nitrogen had been supplied in the 
yard manure than in the sewage : viz., in the first, at the rate of 
642 lbs. per acre, and in the second only 376 lbs. One experi- 
mental plot then had 120 tons of sewage; another, apparently 
60 tons of sewage ; another, 1 ton 11 cwt. of rape-cake, which 
was thought equal to 19 tons per acre of common yard manure ; 
but more could not be procured. 
The sowing of the oats was delayed till the 7th of May. A 
rainy season set in before the top-dressing of 24 tons was given, 
June 9th, to the 2nd plot. Great heat followed ; the crops 
ripened unequally. The unmanured plot and that manured with 
