and Experiments on Pus. 313 
an advanced age. After this long continued disease, an abundant 
expectoration of quite a different kind from the former sud- 
denly comes on ; by which the patient often dies very speedily; 
sometimes immediately, being seemingly choaked. This kind, 
of matter evidently consists chiefly of the essential ingredients 
of pus (Sect. VII. 1,) with not only the adventitious substances, 
viz. clots of self-coagulated lymph, and sometimes the 
red part of blood, but also masses, which are apparently the 
broken down solid parts, the cellular membrane, the vessels, 
and substance of the tubercles, in a disorganized state. The 
sufferer often says, such matter tastes sweet. The mucus is- 
here in too small a proportion, and not intimately mixed, to 
occasion disguise. 
3. In the bronchitis, or inflammatory affection of the air 
tubes, the membrane remaining entire, attending various 
diseases, e. g. the measles, a fever with a cold, various con- 
tinued fevers, an expectoration of thin cream-like matter- 
occurs, at first gradually, bu' at last in great quantities-, con- 
tinuing for a week or more. Although mucus is usually 
coughed up with this puriform substance, the two things 
generally remain in distinctly large masses. With little skill, 
the opaque or puriform fluid may be collected separately from 
the mucous matter. It will be found to consist almost purely 
of the three essential constituents of pus (Sect. VII. 1,) there 
being seldom any adventitious substances. 
4. Muco-purulent, or commixed expectorated matter. This 
kind is perhaps of the most frequent occurrence. It is that, 
which many physicians know not how to designate, some con- 
sider it to be pus, and others to be mucous matter. This con- 
trariety of opinion arises from the want of definite notions of, 
