24 Dr. Pearson’s Experiments and Observations 
soda, (the pneumatic apparatus being affixed,) discharged no 
carbonic acid into lime water ; but a transparent solution was 
produced, and, on cooling, very little was precipitated. 
The second portion was, in the same manner, boiled in a little 
lye of caustic soda ; which gave a transparent solution on cool- 
ing, without any precipitation. 
The third portion being boiled with lime water, very little 
more seemed to be dissolved than in pure water. 
The fourth portion being boiled with 4 grains of subphos- 
phate of lime, or calcined bone, no more seemed to be dis- 
solved on account of this addition. 
Nor was more dissolved in the fifth portion, by the addition 
of 4 grains of phosphate of lime, made by dropping phosphoric 
acid into lime water. 
And the result was the same with the sixth portion, to which 
were added 4 grains of superphosphate of lime, made by add- 
ing phosphoric acid to lime water, so as just to make a clear 
solution, and then evaporating the solution. 
9. Urine seemed to dissolve, or at least to suspend, a greater 
quantity of the precipitate than mere water ; so likewise did wa- 
ter with a little sulphate of soda. 
10. The precipitate did not render solution of hard soap 
at all curdy; but, on adding the precipitate to solution of, 
sulphuret of potash, it became very turbid. 
11. The precipitate produced a strong effervescence, even 
in the cold, with nitric acid, but the fumes were not those of 
nitrous acid : there was a clear solution, which, on evaporation 
to dryness, afforded black matter, surrounded by a pink, or 
blood-red margin. 
12. The substance, with sulphuric acid, turned black, and 
