2 
COMPARATIVE EXPERIMENTS ON THE EFFECT OF 
By treatment with hot concentrated hydrochloric (sp. gr. 1.15) 
and sulphuric acids, and with aqueous hydrofluoric acid, the 
following results, per cent of the soil dried at ioo° C., were 
obtained. 
Upland Soil. 
Paddy Soil. 
With hy¬ 
drochloric 
acid. 
With 
sulphuric 
acid. 
With hy¬ 
drofluoric 
acid. 
With hy¬ 
drochloric 
acid. 
With 
sulphuric 
acid. 
With hy¬ 
drofluoric 
acid. 
Silica' 1 . 
15.60 
1.32 
16.96 
18.60 
1.41 
17.42 
Alumina . 
17.67 
0.68 
434 
17.05 
O.70 
3.01 
Sesquioxide of iron. 
6.79 
o -37 
2 . II 
3-95 
O.40 
I.40 
Protoxide of iron . 
4-03 
— 
— 
4.71 
— 
— 
Lime. 
0.76 
0.13 
I.42 
O.ÇO 
0.13 
0.94 
Magnesia. 
I.70 
0.10 
i -34 
0 66 
0.12 
O.70 
Potash . 
O.27 
0.10 
0-53 
0.32 
O.C9 
0-33 
Soda. 
0.23 
0.08 
O.72 
O.ig 
0.1 2 
0.33 
Phosphoric acid . 
0.34 
— 
— 
0.49 
— 
— 
Sulphuric acid. 
0.20 
•— 
— 
0.16 
— ■ 
— 
Chlorine. 
O.07 
— 
— 
0.03 
— 
— 
Total fluxed mineral matter.. 
47.66 
2.78 
27.42 
47.06 
2.97 
24.13 
Undissolved mineral matter. 
30.20 
27.42 
— 
27.10 
24-13 
— 
Though the samples taken for the above analyses were not 
from exactly the same parts of the farm where our experiments are 
now being carried out, they fairly represent the main features of 
the chemical condition of the whole farm, and make it evident 
that the two kinds of soil are of the same geological origin, and 
are therefore well suited to the purpose in view. 
The following 7 kinds of phosphates which, with the exception 
of the raw crushed bones, are identical with those applied in the 
researches on the paddy field, were submitted to the experiment : 
i. Double Superphosphate containing 47.84 % total phospho¬ 
ric acid, 43.65 °l> soluble in water and 3.08 % soluble in neutral 
ammonium citrate. 
3. Including the silica rendered soluble in sodium carbonate by the treatment with 
hydrochloric and sulphuric acids. 
