S3 3 Dr. Pearson on expectorated Matter. 
eighteen grains of muriate of soda, with an inappreciable 
quantity of ammonia, and perhaps phosphoric acid, besides the 
oxide of animal matter, and possibly an acid of an unknown 
kind. 
(/). The undissolved matter (6) was burned in a platina 
crucible. It afforded a residue, which I could not render fluid 
by fire, but only of the consistence of paste. On cooling, it 
was a brittle gray mass weighing fifty-six grains, somewhat 
salt and gritty to the taste. It consisted of muriate of soda 
and phosphate of lime, about twenty-three grains of each, — 
of potash four grains — of fused matter, which by long boiling 
in muriatic acid yielded phosphate of lime, muriate of lime, 
and utterly indissoluble vitrefied matter with traces of mag- 
nesia, oxide of iron, and a sulphate. 
2. Four thousand grains of expectorated matter of the third 
kind, page 31 7, § II. 3 were added to two pints of rectified spirit 
of wine. By agitation, the spirit became at first milky, but pre- 
sently it grew clear ; little curdy masses appearing, which 
fell to the bottom as a sediment, being in bulk about one 
fourth of that of the added expectorated matter. 
After a month’s digestion, the filtrated liquid, on evapora- 
tion, afforded a dry extract-like residue, weighing sixty grains. 
It grew moist by exposure to the air, but not when kept in 
close vessels. It consisted of the same ingredients, but in 
very different proportions, as the residue from distilling and 
evaporating the tincture, page 323, § III. 2, the present resi- 
due containing a much larger proportion of muriate of soda, 
and oxide of animal matter. 
Successive digestions of the same matter afforded less and 
less saline residue, but nearly the same proportion of oxide 
