36 
Dr. Carson on the 
glass globe. An opening was then made through the chest 
of the animal on each side, and the air admitted into contact 
with the external surface of both lungs. The water instantly 
sunk about two inches in the upright tube, and the lungs were 
gently pressed out at the openings. Hence it was inferred, 
that the spring given to the air by the pressure of a column 
of water nine inches high, was stronger than the elasticity of 
this animal’s lungs expanded to the dimensions of the chest. 
To my surprise and disappointment, the water began to sink 
still lower in the glass tube, and stood at last at the height of 
an inch above the level of the water in the globe, and the 
lungs at the same time gradually collapsed. Water was again 
poured into the upright tube, till it stood for a few seconds at 
the height of nine inches above its level in the globe, and the 
lungs again filled the chest. Upon applying the ear to the 
openings, the cause of the collapse of the lungs was dis- 
covered. The sound of air was distinctly heard pressed 
from the lungs at the openings. Hence it was concluded, 
that the pleura pulmonalis had been wounded in opening the 
chest. 
On the 28th of August of the same year, a bullock recently 
slaughtered was made the subject of experiment. The same 
apparatus, using only a pipe of a larger diameter to be inserted 
into the larger windpipe of the animal, was applied as in the 
preceding case. Water was poured into the upright tube 
at C, until it stood at the height of one foot above the level 
of the water in the globe, and at that of four inches from the 
top of the tube. Openings were then made in the chest to 
admit the air. The water instantly rose in the tube two 
inches higher, and remained stationary at that point. The 
