33 4 Dr. Pearson’s Experiments and Obfervations 
00 Tt was not diminiffied or altered in its properties by 
boiling in lixivium of alkali of tartar. 
(y) Nitrous acid formed with it, without effervefcence, a 
very (lightly turbid folution ; which folution produced the fame 
appearat^ces as thofe related, p. 330, 
(/) 5 ® g rains ®f powder were diffolved in nitrous acid, 
and a great part of the redundant acid being carried off by 
evaporation, to one half of this folution was added lime- 
water till it ceafed to produce any milkinefs, and the mixture 
tailed of lime-water. After Handing excluded from the air, 
the fediment depofited from a clear liquid was collected, and 
being dried it weighed 26,3 grains. This precipitate had the 
properties of phofphorated lime, with that proportion of lime 
and phofphoric acid which forms a compound fcarcely fufible. 
The liquid in which this precipitate fell feemed to contain a 
little phofphorated lime, but principally calcareous earth. 
(3-) To the other half of this folution in nitrous acid 
(/) was added vitriolic acid, drop by drop, till it no longer 
dillurbed its tranfparency. After Handing, the clear 
liquid was decanted from the precipitated matter which had 
taken place, and the precipitate with a fmall quantity of 
water was thrown upon a filter. The filtered and decanted 
liquids mixed together were boiled till the fmell of nitrous 
acid ceafed, and there remained about half an ounce of 
acid liquor, which being filtered to feparate the vitriolated 
lime precipitated during evaporation, foflil alkali was added 
to perfectly faturate it. During this union there was an effer- 
vefcence and a feparation of more vitriolated lime, which being 
removed, the faturated liquor, by cryflallization, afforded 
nearly 26 grains of cryflals of phofphorated Mil alkali, be- 
fides 
