136 On the Compofition and Properties 
three ounces, the diftilled Jiquid was found to contain nothing 
but a little ammoniac. The three ounces of refiduary 
liquid, being filtrated and evaporated, yielded 20 grains of 
phofphate of ammoniac, with a little animal matter; and 
the refiduary undiffolved matter amounted to 67 grains. 
°6. Thefe 67 grains, being triturated with four ounces of 
cauftic foda lye, difcharged very little ammoniac. On dif- 
tilling this mixture to one ounce, a very fmall proportion 
only of ammoniac was found in the diftilled liquid. . The 
refiduary ounce of alkaline liquid was filtrated, and mixed 
with the water of elutriation of the undiffolved matter. “One 
half of thofe liquids, on evaporation to drynefs, afforded a 
dark brown matter, amounting to 20 grains, which confifted 
of phofphate of lime and animal matter. To the other half 
of the alkaline liquids was gradually added muriatic acid, 
which occafioned a depofit; in {mall proportion, of matter 
that diffolved in nitric acid, but which, on evaporation to 
drynefs, left behind only a brownith matter, ati $5 3 of 
phofphate of lime and animal matter. 
4. The refiduary infoluble fubftance in cauftic lye, (6.) 
under the blowpipe, firft turned black, and then grew white, 
but could not be melted, 
By diluted fulphuric acid it was eooaseheaee On the 
addition of nitrate of mercury, to the filtrated liquid, it yield- 
ed phofphate of mercury; and, with oxalic acid, it afforded 
oxalate of lime; but no fulphate of magnefia was found re- 
maining after thefe precipitations were produced. 
Thefe experiments fully demonftrate, that the above con+ 
eretion of a dog contained none of the uric or lithic oxide 
above defcribed, but that it confifted, principally at leaft, of 
phofphate of lime, phofphate of ammoniac, and animal - 
matter. 
The prefent inftance leads me to explain the reafon*of the. 
fufibility of calculi. This is demonftrated by the above ex- 
periments, to depend upon the difcharge and decompofition 
ef the ammoniac of the phofphate of ammoniac, curing the 
burning 
