effects produced on the air cells of the lungs^ &c. 303 
remarked that the quicksilver did not pass so quickly into 
the cells as in his former attempts to fill those of the human 
lungs. 
Mr. Bauer some days after examined the internal struc^ 
ture in the microscope, magnifying the parts 20 diameters. 
He found not only the cells full of mercury, but the branches 
of the bronchiae which terminated in them also distended 
with it, which was not the case in the human lungs ; the 
terminations of the bronchiae being composed of elastic mem¬ 
brane, had squeezed out the quicksilver. 
This difference of structure of the more minute branches 
of the bronchise, may be a provision of nature to give a ready 
admission of air into the cells at the time the animal is hard 
run, while in the human lungs, the elastic membranous 
structure admits of the volume of air being varied according 
to circumstances, as we find it is in the act of singing, and 
in playing on wind instruments, which I understand is often 
attended with bad consequences in such individuals whose 
lungs are of a delicate texture ; and when long persevered 
in has even proved fatal, from producing probably the same 
effect as in animals that are hard run. The white specks 
that have been described appear to be portions of coagulable 
lymph, separated from the circulating blood, in consequence 
of the disturbed state of that fluid in its passage through the 
branches of the pulmonary artery, and afterwards deposited 
in the larger and superficial air cells, in the same manner as 
coagulable lymph is deposited on the internal membrane of 
veins during a state of inflammation of these canals. That 
such a separation frequently takes place while the blood is in 
a fluid state, both in the body and when drawn from the 
