and Spinal Marrow of living Animals. 189 
and intestines, which also renewed their peristaltic motions. 
I then irritated the par vagum and intercostals, about an inch 
above the lower cervical ganglion of the intercostal ; the oeso- 
phagus contracted strongly through its whole length, but the 
heart continued perfectly motionless. On dissection, I found 
a small branch of a nerve, running down from the second cer- 
vical to join the phrenic of the right side, but too insignifi- 
cant to have any effect on the experiment. This experiment 
confirms those made by Mr. Hunter, in which he recovered 
the animals by inflating the lungs, and on which his method 
of recovering apparently drowned people principally rests. It 
shews that respiration is the prime mover of the machine, and 
it takes off* whatever objections might have been raised, from 
the animals, upon which he made his experiments, having the 
connection with the brain entire (as the par vagum and inter- 
costals were not divided), since here the same thing took place 
in these experiments where nerves could have no effect. 
If, in the opinion of the judicious, these experiments have a 
tendency to be useful to mankind, the author will forgive 
those censures, which unphilosophic severity may throw on 
him, whilst it views, only, some unavoidable circumstances at- 
tending the performance of them. 
EXPLANATION OF THE PLATE (Tab. XVI.) 
Fig. 1. shows the trachea, par vagum, and intercostals of the subject 
of experiments 1. and 11 ; the transverse bristles show the quantity of 
nerve lost by excision, and of course the quantity gained by regeneration. 
Fig. 2. shows the same parts in the subject of experiment in. 
The bristles point out the mode of reunion of the divided- nerves by 
coagulated blood. 
Fig. 3. shows both the complete reunion of the nerve after division, 
and its regeneration after the loss of substance, in the subject of experi- 
ments iv. and v. 
