Dr. Pearson on expectorated Matter. 321 
In another hospital case, a man laboured under a cough with 
spitting of matter, which all who saw it called pus, and as 
usual it was considered to arise from an ulceration, or suppu- 
rated tubercles ; but, on examination after death, the disease 
was ascertained to be condensation of the lungs, to the con- 
sistence of liver, with water in the cavities of the chest, and 
nothing more. 
5. Opaque viscid matter of the third , and perhaps fourth sort , 
above distinguished, appearing in nodules, and irregular fi- 
gured masses, mixed with transparent slimy matter of the second 
sort. 
It is not unusual to see the mixture of these two different 
kinds, from severe fits of coughing in that constant epidemy 
of the British islands, the winter chronical pneumonia. 
Different parts of the bronchial membrane being in diffe- 
rent states, may account for the secretion of the two different 
matters. This seems more probable, than that these different 
matters should be secreted from the same part ; although it is 
true that the same part does secrete at one period transpa- 
rent thin slime, and at another an opaque thick matter. The 
former is occasioned by great irritation of the membrane, and 
the latter is the effect of a more gradual secretion with much 
less irritation. 
For the sake of brevity, I avoid a further description. The 
practical application of these observations, however impor- 
tant, would not be suitable in this place. 
The sixth and seventh kinds of expectorated substances 
being secreted after a quite different manner, and being very 
different in their nature from the preceding five kinds, I shall 
not give an account of them in this paper. 
