28 
effect upon it. The water is held in intimate combination, 
and is only expelled at a higher temperature when it is 
accompanied by fumes of Sulphur, Sulphuric and Sul- 
phurous -Acids. The residue contains, besides Lime and 
Phosphoric Acid, Sulphate and Sulphide of Calcium. 
Cold water has no effect upon the Sulphited Phosphate 
ol Lime. After long continued boiling, the air being ex- 
cluded, a partial decomposition takes place, which is shown 
by the following analysis. 1000 CC of the water contained: 
50 2 Q’268 grm. 
50 3 0*047 „ 
P0 5 0-1181 „ 
CaO 0-2045 „ 
and an undetermined quantity of the undissolved residue 
contained : 
S0 2 0-03464 
P0 5 0-12393 
CaO 0-13916 
The constituents are therefore in the following proportions* 
In the solution: 
leq P0 5 ; 4*35eq CaO ; 5‘07eq S0 2 ; 0’71eq S0 3 
and in the residue: 
leq P0. 5 ; 2-85eq CaO ; 0-623eq S0 2 . 
The Sulphite, which withstands the action of the atmos- 
phere indefinitely, is rapidly oxidized when incorporated with 
soil. A quantity was buried in a heavy clay soil (which, as 
was ascertained previously, contained no Lime and Phos- 
phoric Acid soluble in dilute Hydrochloric Acid), and was 
exhumed after two months, when it was found to be free from 
Sulphurous Acid. The sample was selected for analysis 
with the least possible quantity of soil. It contained 
so 3 ......... 
P0 5 ......... 
24-58 
CaO ......... 
......... 33-66 „ 
