r)2S On the Food of Plants. 
20 grains of ash gave, on analysis : — 
Soluble portion — 
Sulphate of potash . . 
Chloride .... 
Silica .... 
Insol. portion — 
Siliceous scales . 
Earthy phosphates, carbonates,) 
&c. (bj' difference) . . j 
Water .... 
In 100 Jiai ts. 
1 ' 
■T2 
8 
0' 
'58 
2 
0- 
1 
. 0 
16' 
'0 
. 80 
1 
■4 
. 7 
0 
"2 
. 1 
20' 
•0 
100 
IG grains of siliceous scales, by fusion with carbonate of sotla, 
&c., gave : — 
Silica . . . . IS-T 
Phosphates . . . 0-47 
Carbonate of lime . . 0.7 
Alkali, and loss . . . 1-13 
lG-0 
Portion of soluble salt extracted and converted into chloride: — 
3 grains ignited gave of double platinum salt 9 '05 grains ; corre- 
sponding to 2 "77 grains of pure chloride of potassium. 
Hence, a little £oda present, which may have been derived from 
the nitrate. 
Grain from the above straw : 
500 grains by incineration gave of ash . 4" 8 grains. 
500 ..... 5-0 „ 
500 . . . . . 4-4 „ 
Or, as a mean, '946 per cent. 
10 grains gave, on analysis : — 
111 100 parts. 
Phosphate of potash , . . 5 ' 3 . 53 
Phosphates of magnesia and lime . 3'1 . 31 
Sandy matter and charcoal . . 1'3 . 13 
Water . . . . .0-3.3 
10-0 100 
Soluble phosphate converted into chloride, and examined for 
soda : — 
2'8 grains of ignited chloride gave of platinum salt 8*9 grains; 
corresponding to 2*72 grains of pure chloride of potassium. 
