124 ANALYTIC SECT. XVI. 
SECTION XVI. 
Irritability of the Lungs. 
cexcu. The air cells of the lungs are spungy, 
fibrous, and easily compressible: it is in them 
that the divisions and subdivisions of the Bronchi 
terminate. 
ccexciu. The lungs, according to Helvetius, are 
composed of numerous small lobules, “ which 
are only bundles of cells inclosed in a membrane 
proper to each. The cells of one lobule com- 
municate together, and the air passes without 
difficulty from one into the other; but different 
lobules have no communication with each other: 
from this it follows, that all the air contained in 
cach cell, passes out from the whole at the same 
time.” ) 
ccxciv.. Haller denies this opinion of ‘Hel- 
vetius; but admits, at the same time, that the air 
cannot pass from lobule to lobule. In these 
times, it is generally admitted by the best 
physiologists of France. 

