499 
on air found in the pleura, &c. 
lung, this viscus contained small tubercles, few in number in 
the inferior lobe, but abundant in the superior lobe. The 
largest of them did not exceed in size a common pea, and the 
smallest were not larger than mustard seed. The smallest 
were translucent ; the larger were of different degrees of opa- 
city ; all of them were solid, and none of them had suppu- 
rated. The left lung was free from adhesion ; like the right, 
it contained numerous small tubercles, that had made very 
little progress. Thebronchia, and the lower partof the trachea, 
were redder than natural. There were three ounces of serum 
in the pericardium, and a larger quantity of fluid than usual in 
the ventricles of the brain. No air was observable in the blood 
vessels or in the cellular membrane of any part of the body. 
I shall now return to the contents of the right pleura. The 
water taken from the pleura (viz. that which entered when 
the air was discharged,) was turbid, as if from the admixture 
of pus. After resting 24 hours in tall glass jars, a white 
sediment formed, which, carefully separated by decantation, 
was about an ounce in quantity. It had the appearance of 
pus, and exhibited the properties of pus when examined by 
the most approved tests : — thus it became viscid with a solu- 
tion of muriate of ammonia ; it was soluble in sulphuric acid, 
and precipitable by dilution with water ; and it produced 
coloured rings when placed between two surfaces of glass and 
held before a candle, according to the method recommended 
by Dr. Young. The decanted fluid, examined by solution of 
corrosive sublimate and by evaporation, was found to contain 
serum ; and, judging from the extract it afforded, it was about 
eleven ounces in quantity ; half an ounce of the decanted water 
having yielded, when evaporated, 2.2 grains of dry residue. 
