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766 *The Relations of Mind and Matter. [August, 
through inductive transfer of its energy to a series of fibrillz 
which are short circuited in the ganglion and make no connection 
either with ingoing or outgoing nerves. 
This hypothesis of an analogy between the action of the ner- 
vous current and that of electric induction is at least of some in- 
terest, and may be further pursued. We have argued that to this 
checked current the phenomena of memory are due. If it arise 
from the transfer by induction of the sensory current to a series 
of fibrillæ, forming a secondary short circuit through the gan- 
glion (continuous, of course, as all inductive currents must be), 
then we would have here a new apparatus for the operation of 
organic forces, and one leading directly to the development of a 
separate cerebral organ. For, as above considered, in the devel- 
opment of the nervous system the check to the sensory current 
in the ganglia became a duty of growing importance, and the 
volume of checked energy steadily increased with the growth of 
nervous susceptibility. If, then, this check took place through 
the action of a separate inductive circuit, this apparatus must 
have developed with its increase of duty. At first confined to 
the same cells which transmitted the reflex current, the inductive 
fibrillæ may have grown in length and number, and in time 
gained cells of their own, with connecting fibers. Through these 
cells the checked current would produce its final effect, whether 
of memory conditions or otherwise. By a continuance of such a 
process the cells of the inductive circuit might become separated 
entirely from those of the primary circuit, forming first a cerebral 
layer upon the central reflex ganglion, and finally a completely 
separate ganglion connected only by nerve fibers with the system 
of reflex ganglia. 
Such is conceivably the mode of origin of the cerebrum, and 
the character of its nerve relations with the nerves of the reflex 
system. As intelligence grew and the great mass of sensations 
were transmitted to the cerebral circuit, this organ would neces- 
sarily greatly develop, until from a series of secondary fibrille 
short circuited through one or a few cells, it became the great 
cerebral organ of man, with its highly important function of the 
ae evolution of the mind. 
oS may very briefly recapitulate the conclusions to which the 
regoing arguments have led. The motor energy of the exter- 
nal ate makes its way in various forms or phases into the ani- 
