852 The Relations of Mind and Matter. (September, 
been rendered almost certain, by the researches of Ferrier and 
others, that each region of the cerebrum has its special duties, to 
the performance of which it is strictly confined. Here sensation 
seems to center; there motor impuls¢s arise. Into this locality 
flow the sensations of sight; into that locality those of taste or 
smell. Speech has its center here; the motion of a particular 
muscle there, Instead of the whole brain being concerned in 
every action, each limited portion seems to be immediately and 
strictly related to some fixed sensory or motor region. The 
evidences of this are as yet somewhat broad and general, yet they 
are steadily growing more precise and particular. Every nerve 
fiber proceeding from a sensory end organ or a group of muscle 
fibers may connect directly with a special group of brain cells, 
and possibly every fibril of these fibers may terminate in a single 
brain cell at one extremity, and in a single muscular fibril or 
sensory point at the other. If such were the case the brain would 
be closely related in condition with the outer terminations of the 
nerves, and the nervous system would consist of a vast series of 
fibers diverging outwardly to terminate in a widely separated 
series of sensory and muscular cells and fibrils, and converging 
inwardly to terminate in a closely aggregated series of nerve 
cells, the latter being as individual in their duties as the former, 
despite their much closer grouping. 
This, of course, is purely hypothetical, yet the special relation 
of groups of brain cells to groups of sensory or muscle cells or 
fibers has been established by experiment, and it is not safe to 
limit the possible minuteness of this relation. Yet the existence 
of such a relation seems to stamp the brain as the instrument of 
an interior mental organism. In the operations of the mind 
there is no evidence of such a disconnected series of duties. The 
mind constantly impresses us as an intimate unity. Its thoughts 
are in continual rapport, and call up each other with instantaneous 
rapidity. Such a relation could not well exist between the imag- 
ined localized vibratory energies of the brain. If each locality 
were capable of sending ‘its vibrations at will to any other local- 
ity, and rousing into activity the energies of distant regions, what 
is to hinder the complete dissemination of these energies? If 
o such a condition existed, the fibrils of every cell in the brain 
"must soon become affected with a vast multitude of diverse and 
_ frequently discordant pulsations. And it is impossible to imagine 
