Dr. Philip’s additional experiments, & c . 425 
an animal of cold blood, I may refer to the seventh and 
eighth experiments related in the paper above alluded to, in 
which the carotid and femoral arteries were found beating 
and performing the circulation after the spinal marrow had 
been wholly destroyed. 
The labours of M. le Gallois, by ascertaining some facts 
of great importance, while others immediately connected 
with them escaped his observation, have involved the subject 
in such seeming contradictions as, at first view, to have per- 
suaded me that some of his experiments were inaccurate. On 
repeating many of them, however, I was convinced of their 
accuracy. In some the destruction of the cervical part of the 
spinal marrow immediately destroyed the function of the 
heart ; yet in others the destruction, in a different way, of 
the same, or a larger portion of the spinal marrow, little 
affected it. In some, the greater part of the spinal marrow 
was destroyed without destroying the function of the heart; 
yet in others, after the spinal marrow had been divided, he 
found the function of the heart destroyed by the destruction of 
either half. 
It was the confusion arising from these, and similar diffi- 
culties, that occasioned him to observe that he had almost as 
many results as experiments, and that he had resolved to 
abandon the investigation, when his explanation of the first 
of the foregoing difficulties, founded on the supposition which 
suggested the above experiment, presented itself to him. Had 
it occurred to him to compare this supposition with the latter 
difficulty, he would have doubted its accuracy. 
The seeming contradictions which appear in the experi- 
ments of M. le Gallois cannot be reconciled, except on prin- 
mdcccxv. 3 I 
