32 
used with advantage as being applicable to places which 
could not be reached by the other. 
The neutrality, regularity of composition, utter harmless- 
ness, and freedom from smell and taste, recommend the 
Sulphited Phosphate of Lime for trial in Therapeutics. It 
would be of interest to investigate it in relation to putrid 
puerperal fevers, Pyaemia, &c. 
It appeared to me not unlikely that a compound of 
Phosphate of Lime with 2eq Sulphurous Acid might exist. 
Numerous experiments, made with a view of preparing the 
same, have entirely failed, but some of the results are 
interesting as showing unexpected reactions of these com- 
pounds. 
The Sulphite of Phosphate of Lime is not acted upon by 
the solution of Phosphate of Lime in Sulphurous Acid. 
Sulphurous Acid Gas is only absorbed in very small pro- 
portion by either dry or wet Bone Ash. This Phosphate of 
Lime is not even converted into the Sulphurous Acid com- 
pound by digestion with the Sulphurous Acid solution. 
If Sulphurous Gas is passed through water holding an 
excess of Phosphate of Lime in suspension, the latter 
remains unchanged. 
Under the receiver of an air pump the Sulphurous Acid 
solution forms good-sized crystals, probably belonging to 
the hexagonal system. Analyses of crystals of different 
preparations gave varying results, which however agreed 
tolerably with the formula 
x( 3CaO, P0 5 , S0 25 2H0) + y(CaO, S0 3 , 2HO) + z(CaO, S0 2 + 5HO) 
The more crystals separate from the solution, the more the 
Phosphoric Acid accumulates in the latter. In one instance. 
Lime, Phosphoric Acid, and Sulphurous Acid were almost 
in proportion of their equivalents. 
Alcohol precipitates the solution of Phosphate of Lime in 
Sulphurous Acid. The analysis of the precipitate gave 
