114 LIVERPOOL BIOLOGICAL SOCIETY. 
noted, the skin of the abdomen was stimulated either by 
heat, by an induced electrical current, by a chemical — 
irritant, or mechanically by pinching or otherwise, and 
coincidently a negative variation was shown by the gal- 
vanometer, indicating that a nerve impulse had travelled — 
round by the intercostal nerves, and had produced an 
active condition of the nerves of the intestine. 
This experiment is one of some difficulty, and cannot 
reasonably be expected to succeed always; it has, however, 
succeeded so frequently that little doubt can be entertained 
of the fact it was intended to demonstrate. 

il 
tH 
i 
Hy 

