530 On the Food of Plants. 
20 grains of ash contained : — 
Soluble portion — 
Sulphate of potash . . . ."'47 
Chloride, silica, &c. . . 0 13 
Insol. portion — 
Siliceous scales . . . 13*5 
Phosphates . . . . 1 ' 7 
Carbonate of lime . . . 1*0 
Alkali and loss . . . 0*2 
111 100 parts. 
17-35 
0-65 
67-5 
8-5 
5-0 
ro 
20-0 
Grain of the foregoing ; — 
1000 grains' weight of rye gave of ash . 15 ' 
Or, 1 • 55 per cent. 
10 grains, on analysis, afforded : — 
Phosphate of potash . . .5*4 
Phosphates of magnesia and lime . 3' 8 
Siliceous matter and charcoal • . 0*G 
Water ... . . 0-2 
100-0 
b srrams. 
Ill 100 paits. 
. 54 
. 38 
6 
9 
10-0 100 
G. Common spreading oats, grown in Battersea Fields, in 
liighlj-manured soil. The oats were cut before fully ripe : the 
straw was in a most extraordinary state of development ; but the 
grain itself was dark-coloured, poor, and thin. 
Straw : — 
500 grains of whole straws gave of ash . 38-0 grains. 
500 ...... 35-2 „ 
Or, 7 "32 per cent. 
The incineration proved very difKcult from the fusibility of the 
ash ; a circumstance never observed in the other straws. 
20 grains gave, by analysis : — 
Soluble portion — 
Sulphate of potash . 
Silica .... 
Potash in union with silica, plios- ( 
phate, and little chloride . f 
Insol. portion — 
Siliceous scales . 
Earthy phosphates 
Carbonate of lime 
Water ,. . 
Alkali, &c., and loss 
111 100 parts 
3 
11 
. 15-55 
1 
35 
G-75 
5 
94 
. 29-7 
4 
65 
. 23-25 
1 
8 
9-0 
1 
25 
G-25 
4 
2-0 
1 
5 
7-5 
20 
•0 
100-0 
