of the black Bronchial Glands, &c. i(5i 



lye, or in nitric and muriatic acids, that I could totally sepa- 

 rate the black matter from the animal substance to which it 

 seemingly adhered. After repose, a black sediment took place 

 in the waters of elutriation, as well as from the alkaline, and 

 the acid dissolution, which on decantation and evaporation to 

 dryness, aiforded the deposit in the state of a black powder. 



The texture and proportion of the tingeing matter of the 

 glands was very different in different subjects ; whether the 

 lungs, to which they belonged, were in a healthy or diseased 

 condition. In persons of about eighteen to twenty years of 

 age, some of the bronchial glands contained no tingeing black 

 matter at all, but v^re of a reddish colour ; others were 

 streaked, or partially black ; and others were quite black, or 

 of a dark blue colour. 



3. By boiling the black glands in lye of caustic potash their 

 structure was destroyed, and a turbid black liquid was pro- 

 duced : from which, on standing during several days, a copi- 

 ous black sediment took place ; but the liquid still remained 

 black, after remaining at rest a month ; much of the tingeing 

 matter continuing suspended. By dilution with water, this 

 matter deposited in a clear liquid. 



4. By liquid muriatic acid, of the specific gravity 1,170, the 

 bronchial glands were dissolved at a boiling temperature, af- 

 fording a turbid black liquor ; but on repose, an abundant black 

 deposit took place from a clear yellow liquid, as well as a 

 quantity of the same matter appearing on its surface. On 

 separating this precipitate, and evaporating to dryness, 'it 

 became a black powder. ^ .-> - ' '' -« ^ ' 



5. Nitric k'cid liquid, of the specific gravity 1,500, most 

 speedily dissolved the substances under examination, affording 



jf. 



