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XXIII. Of the Nerves which associate the muscles of the Chest, 
in the actions of breathing, speaking , and expression. Being a 
continuation of the paper on the Structure and Functions of the 
Nerves. By Charles Bell, Esq. Communicated by Sir 
Humphry Davy, Bart. LL. D. P. R. S. 
Read May 2, 1822. 
Xn a former paper an examination was made of the nerves 
of the face ; that part of the system was taken, as proving in 
a manner the least liable to exception, that two sets of nerves, 
hitherto undistinguished, possessed distinct powers ; and that 
very different effects were produced when the muscles and 
integuments were deprived of the controuling influence of 
the one or of the other of these nerves. In that paper it was 
shown, that parts remote in situation, were yet united by the 
closest sympathy with the lungs. That by a division of one 
nerve, these organs could be severed from the other parts of 
the apparatus of respiration ; and though rendered dead to the 
influence of the heart and lungs, were yet possessed of their 
other properties, such as sensibility and voluntary motion. 
In the present paper it is proposed to prosecute this sub- 
ject, by tracing the nerves which influence the motions of the 
trunk of the body in respiration, and to subject them to a 
similar enquiry. 
It is an encouraging circumstance to the Author of this 
Paper, and may incline the Society to bear with the detail 
