846 The Relations of Mind and Matter. (September, 
must admit that the development of the mind takes place through 
the agency of external energies transmitted by the nervous 
mechanism. 
But these energies are entirely motor. They are either radiant 
vibrations emanating from some distant substance, or the motions 
of molecules impressed upon the body through direct contact. 
Each of them has its special character, but they are all motions. 
In their transmission inward over the nerve fibers they continue 
to be motor agencies. They are now some mode of radiant 
energy. Those that pass through the ganglia and reach the 
muscles, prove their motor character by disturbing the motor 
relations of the muscle cells. Those that are retained in the 
ganglia, and yield other effects, must do so as motor agencies. It 
is simply impossible that motion can become anything else. Nor 
can it exist independent of substance. Nor can it cease to exist. 
Every quantity of motion must of absolute necessity continue to 
exist as the same quantity of motion. It cannot lose or gain 
quantity, or change into some condition that is non-motion. Nor 
can it exist as an immaterial condition. It is indissolubly wedded 
to substance. 
These conclusions can scarcely be questioned by any scientist, 
yet they lead to certain important inferences, If the develop- 
ment of the mind takes place solely through the influence of 
special motions, conveyed to it over the channel of the nerves, 
then the mind must necessarily be based in substance, and its 
energies must necessarily be motor. The idea that an immateri- 
ality can be organized by motor agencies is a mere metaphysical 
phantasm. 
But though a definite quantity of motion cannot lose or gain, 
its action upon matter may be almost infinitely varied. It may 
separate and become widely diffused, or it may become definitely 
fixed in a certain aggregate of matter. The organization of mat- 
_ter takes place solely through the influences of its inherent mo- 
= tions. The concentration of a crystal may be due to attraction, 
= but its peculiar characteristics are undoubtedly due to the special 
= motions of its particles. And an Amceba is superior in organi- 
zation to a crystal solely through the vastly greater complexity 
and intricacy of the motions which affect its particles. In all 
these cases of aggregation the attractive agency seems to be sin- 
riri in character. Its full effect is resisted by the 
