136 ANALYTIC SECT. XVII. 
cccxxvil. Again, in those countries where it is 
customary to treat hemiplegia with emetics, para- 
lysis of the sound side is often brought on by the 
long and violent expirations of vomiting. 
cecxxvill. Some of Bichat’s experiments would 
incline us to believe, that the motion of the blood 
in the pulmonary veins, is accelerated by expira- 
tion; I have met some proofs corroborative of 
this idea, but as yet I have not entirely satisfied 
myself of their accuracy. 
cccxxrx. The entrance of the blood into the 
pulmonary air-cells, produces a peculiar rushing 
sound, singularly varied by age and disease; on 
the difference of this sound during inspiration 
and speaking, Laennec has contrived to extend 
greatly our knowledge of the morbid changes 
which occur in all the thoracic viscera. 
cecxxx. The thorax, when struck with the 
tops of the fingers, emits a hollow sound, subject 
also to variation by disease, from which useful 
information may be derived, when the Stetho- 
scope is not at hand, in the manner pointed out by 
Auenbrugger and Corvisart. But diagnosis of 
the chest, by percussion, will most probably give 
place to the more certain method of exploration, 
by mediate auscultation. 
~ cecxxxt. The chemical changes which result 
from the inflation of the lungs, is a subject of 
greater intricacy than the mechanism of respira- 
a ——— 
