Dr. Pearson's Observations 
296’ 
one vessel to another, the curdy masses were manifest, and 
of various sizes, from that of a pin’s head to a hazel nut. It 
was more viscid than the former, and of a little greater spe- 
cific gravity. On standing, a limpid fluid appeared upon the 
top, as in the first kind, but in smaller quantity. Globules 
were seen with the microscope, but also a number of irre- 
gularly figured larger masses. Putrefaction took place sooner 
than in the former kind. In other properties, this pus was 
similar to the first kind. 
III. Serous thin pus. It was produced by a fatal inflamma- 
tion of the peritoneal coat, without ulcer, and taken out of the 
cavity of the abdomen. A good deal of serum was also effused, 
of which the pus was a deposit. It was not much thicker than 
milk. To the feeling it was not at all unctuous. The smell was 
slightly offensive. On standing 24 hours a sediment appeared, 
occupying only one half the full vessel, under a whey-like 
liquid. Putrefaction took place sooner than in either of the 
two former kinds. The specific gravity was the same as that 
of the first sort. In other properties it was similar to the 
cream-like pus above distinguished. 
IV A pint of the viscid pus was obtained from an abscess 
among the muscles of the thigh. If I had not had entire 
confidence in Mr. Brodie’s accuracy, who was so obliging 
as to attend to my request, on this and many other like 
occasions, I should have supposed, that this was expecto- 
rated matter, it so exactly resembled in its simple properties, 
the ropy kind, described in a paper on expectorated matter. 
Phil. Trans. 1809, P. II. p. 317. 
The appearance was not quite uniform, there being semi- 
transparent masses in small proportion, mixed with the 
