Dr. Pearson on expectorated Matter. 327 
acid, and certainly afforded no soda-tartrate of potash — they 
also afforded a precipitate with nitro-muriate of platina — being 
saturated with acetous acid there was still a slight precipitation 
with muriate of baryt; for without acetous acid, there was a 
most copious precipitation with this re-agent, but the greater 
part of the precipitate was dissolved by acetous acid, added 
so as not to supersaturate it. — Oxalate of ammonia did not 
occasion a precipitation, — with nitrate of silver an abundant 
one took place — lime water produced only slight turbidity. 
The muriate of soda amounted, in this saline mass of forty- 
five grains, to thirty-five grains, or nearly to one grain in 450 
of expectorated matter ; the rest was subcarbonate of potash 
amounting to one grain in about 1540 grains of expectorated 
matter, with which was mixed a minute proportion, probably, 
of sulphate and of phosphate of potash, 
(/). The undissolved matter (d) boiled with muriatic acid 
gave a turbid liquid, but on standing, nearly the whole ap- 
peared to have been dissolved ; a small proportion of sedi- 
ment only took place in a transparent liquid, which was boiled 
till it no longer parted with muriatic acid. — This dissolution 
being exsiccated grew liquid on exposure to air ; and oxalate 
of ammonia gradually added, produced, as I decidedly ascer- 
tained, the precipitate of oxalate of lime. 
(g), The filtrated residuary liquid (J); with muriate of 
baryt gave immediately a copious precipitation — with lime 
water there was milkiness produced, and subsequently a white 
precipitation which did not disappear on adding a small pro- 
portion of acetous acid — prussiate of potash occasioned a 
greenish blue colour without precipitation — succinate of am- 
U u 2 
