108 
GRAINS. 
The transplanted clover weighed 0.884 
After 63 days' culture in sand 2.264 
Gain , 5.380 
CARB. HYDR. OXGY. NITR. 
Before culture the plants 
contained grains of ... 0.384 0.048 0.419 0.033 
Afterculture 1.200 0.145 0.863 0.056 
0.816 0.097 0.444 0.023 
Thus, in two montlis' vegetation, from the air alone and 
water, the clover may be said to have tripled its elementary 
matter, and the azote to have been nearly doubled. 
On the 20th June were disposed several plants of oats in 
shelter from dust. The roots were plunged in distilled water. 
On the 10th August the plants bore perfect seeds. 
GRS. 
Before experiment, the plants of oats weighed 1,560 
The whole crop 3,118 
Gain on culture 1,558 
The plants contained before carb. hyd. oxy. azote. 
experiment 0.827 0.106 0.568 0.059 
After 41 days' vegetation ... 1.500 0.193 1.372 0.053 
0.673 0.087 0.804 0.006 loss. 
Comptes Rendus, 19th November, 1839. 
Boussingault also examined, by analysis, the comparative 
proportions of the elements yielded by each crop in a rota- 
tion, and the quantity of manure supplied to the crop. In a 
five years' rotation of — 1st. potatoes or red beet dunged; 
2nd, wheat; 3rd, clover; 4th, wheat; 5th, oats, the 
manure was applied to the first crop, and it was found the 
dung consumed on the hectare contained 2,793 kilogrammes 
of carbon ; in the suite of crops produced by this dung, the 
