Oil the Food of P/aiifs. 
527 
Soluble salt — 
Sulphate of potash 
Chloride of potassium 
Insol. portion — 
Siliceous scales 
Earthy phosphates 
Carbonates of lime, magnesia, 1 
trace of alkali, and loss . J 
2*65 
0-55 
15-5 
0-8 
200 
1 5 • 4 grains of siliceous scales gave : — 
Silica 
Phosphates and oxide of iron 
Carbonate of lime 
Alkali and trace of magnesia 
In 100 parts. 
13-25 
2-15 
77-5 
4-0 
2-5 
100 -0 
13-8 
0-3 
0- 3 
1- 0 
15-4 
Soluble salt converted into chloride, and examined for soda: — 
3 grains of salt gave 9*7 grains of chloride, platinum, and po- 
tassium = 2*96 grains of chloride of potassium.* 
Grain of preceding straw: — 
500 grains of wheat gave of ash, by incineration . 6*5 grains. 
1000 10-7 „ 
Mean = 1 • 18 per cent. 
This ash contained in 10 grains — 
Phosphate of potash, with trace of chloride 4 • 9 
Phosphates of magnesia and lime . . 3'(i 
Charcoal and sandy matter . . . 1 • 3 
Water 0*2 
In 100 parls. 
. 49 
. 36 
. 13 
2 
10-0 100-0 
Soluble phosphate converted into chloride, and examined : — 
2'7 grains of ignited salt gave 8'4 grains of chloride, platinum, 
and potassium = 2*57 grains of pure chloride of potassium. 
3. Wheat from the same field as the preceding, but manured 
with nitrate of soda, 1 cwt. to the acre : an experimental crop. 
Straw : — 
500 grains of entire straw gave of ash . 18 "8 grains. 
500 . . . . . . 18-0 „ 
500 19-9 „ 
The mean gives 3*78 per cent. 
* The absence, to any extent, of soda-salt is thus demonstrated ; all the 
ashes examined gave t7-(ices of soda, of which no mention is made in the 
details of each, that base being estimated with the potash. No error can 
arise from this circumstance. 
VOL. IV. 2 M 
