has a strict reference to the other part of our present
subject.
“ En général, vers l’âge de dix jours, les effets
de la destruction de la moëlle épinière offrent
beaucoup de variétés. Il n’y a de bien constant, à
cet âge, que la cessation subite de la circulation par
la destruction simultanée des trois portions de cette
moëlle, et son affaiblissement plus ou moins grand
par celle d’une quelconque de ces portions. Cela
paraît dépendre de ce que l’influence de chaque
portion sur la circulation, augmentant avec l’âge,
c’est vers l’âge de dix jours quelle approche de son
maoûimum. En effet, la même portion de moëlle
qui, étant détruite à cet âge, n’arrête pas encore la
circulation, l’arrêtera constamment quelques jours
plus tard.”
There still remains the experiment of irritating
the brain and spinal marrow mechanically, in the
batrachia. On this subject, I beg, for the present,
to refer to the experiments of Spallanzani, Fontana,
1 Dr. Philip and, in regard to fishes, of
Mr. Clift.
1 See pp, 88—93.
CHAPTER IV.
OF THE INFLUENCE OF OTHER ORGANS UPON
THE HEART AND CIRCULATION.
W h a t e v e r may be the character of that connection
which subsists between the brain and spinal marrow
and the heart and the circulation, the same thing is
observed, in regard to other, organs or parts, and
the organs of circulation. There may be a difference
in degree ; but there is none in kind. The
heart may be more independent of a limb than of
the spinal marrow; it may be less influenced by
crushing the former than the latter. But still the
principle is the same. It is one of mutual connection,
rather than of individual function. To crush
the brain, no more teaches us the functions of the
brain, than to crush the stomach or the hand,
teaches us the functions of the stomach or the
hand. Such experiments alike set forth the wonderful
a-v^dOua, of the various organs.