70 Dr. Philip’s experiments to ascertain the principle 
then opened between the cervical and dorsal vertebrae. We 
then laid open the thorax, and supported the action of the 
heart by artificial respiration. The force with which it beat 
was carefully observed, and the spinal marrow destroyed by 
running a hot wire up and down the spine, through the open- 
ing made in it, by which the action of the heart was not at all 
affected. 
Exp. 3. In the foregoing experiments, it may be said, there 
was no direct proof of the continuance of the circulation after 
the spinal marrow was destroyed or removed. On this ac- 
count several of the following experiments were made. A 
rabbit, previously exhausted by dividing the eighth pair of 
nerves, was deprived of sensation by a blow on the occiput, 
and the circulation supported by artificial breathing. The 
carotids were seen beating near to the place where the nerves 
had been divided. The cervical part of the spinal marrow 
was then destroyed by a hot wire, after which the carotids 
were still found beating. 
Exp. 4. In a rabbit rendered insensible by a blow on the 
occiput, the whole spinal marrow was destroyed by a hot 
wire, and the breathing artificially supported. One of the 
carotid arteries was then laid bare. Its beating was evident, 
and on dividing it, florid blood flowed from it freely. 
Exp. 5. The only difference between this and the last ex- 
periment was, that artificial breathing was not performed. In 
both, the spinal marrow was destroyed, by introducing a wire 
hot enough to make a hissing noise through an opening be- 
tween the cervical and dorsal vertebrae, first through the upper 
portion into the brain, then through the under portion to the 
end of the spine. On laying open one side of the neck, the 
