Dr. Pearson on expectorated Matter. 329 
muriatic acid (/). I found it to grow soft, and the parts to 
cohere under the blow-pipe, and with a little potash it readily 
melted into an opaque globule. 
8. To obtain a more satisfactory proof of the presence of 
sulphur, forty grains of charred expectorated matter were kept 
in a state of ignition in a platina crucible, with another inverted 
over it to completely exclude the escape of gas, for two hours. 
After cooling, the smell of sulphuretted hydrogen gas very 
evident, on the addition of diluted muriatic acid, and even of 
water only. Silver was tarnished, and paper wetted with 
liquid acetite of lead was blackened by this gas. In some of 
the experiments, while the charcoal was burning off' from the 
charred expectorated matter, I perceived the smell of sulphur, 
and perhaps of phosphorus. 
§ III. Agency of Alcohol of Wine. 
1. ( a ) 2500 grains of desiccated expectorated matter of the 
fifth sort, § I. 5 being the one twentieth of 50,000 grains of 
matter previously to evaporation to dryness, were digested in 
four pints of alcohol of spirit of wine, of the specific gravity of 
815, water being 1000. The mixture was exposed at the tem- 
perature of 58° to 68° for a month, during which it was fre- 
quently shaken. A tincture, of the colour of red port wine, 
was then decanted from off a blackish sediment. By means of 
a press, two ounces more of the tincture were obtained. 
(6). The undissolved residuary matter being exsiccated 
weighed 130 grains less than before digestion. On exposure 
to the air, it remained dry, but it became more flexible. It no 
longer emitted ammonia on trituration with lime. 
