944 The Relations of Mind and Matter. [October, 
lution taking place through the interchange and combination of 
these internal energies. Yet the conditions of this activity seem ` 
identical with the other activities described. The mental organ- 
ism has no more power of arbitrarily changing the relations of 
its own energies than has a crystal. All such changes arise 
through its connection with an external reservoir of energy, the 
brain. The seeming movements of thought through the mind 
are really actions of the energies of thought on the brain, the 
release of brain energy, and the inflow of this energy into another 
region of the mental organism. This mediation of the brain is 
signified by the physiological change that takes place, and also 
by the appearance of consciousness, a condition which seems only 
existent during motor interconnection of the brain and the mental 
organism. 
We may reiterate here the fact that no organized mass—crys- 
tal, seed, solar system or mind—is capable of setting up new 
actions within itself, or arbitrarily instigating changes in its con- 
ditions of motor equilibrium. Such an action would be quite 
as impossible, if we may offer a homely illustration, as the old 
problem of a man lifting himself ina tub. Organizing motions 
cannot possibly change of themselves. Perturbations may arise 
through their interaction, as between the bodies of the solar sys- 
tem, but not permanent changes. And by the very conditions of 
their existence they resist change. All permanent change must 
come from the inflow and action of external energy, and it will 
be resisted to a degree in accordance with the rigidity of the 
organism. In the crystal, for instance, the resistance is vigorous. 
In the mind it is much less so, and varies extremely in minds of 
different degrees of development. If all mental change was pro- 
duced by external impulse, then the brain might be its organ. 
But the existence of internal mental change renders this impossi- 
ble. Such change can only take place under the instigation of 
external energy, and the brain is the source of this energy. The 
thoughts which seem to flow from region to region of the mind, 
evidently do so through the intermedium of the brain, since all 
activity of thought is attended with chemical change in the brain 
_ cells, And the energy thus yielded is the active agent in the new 
_ idea formed. It would seem as if every rapport between brain 
and mind instigated oxidation in the brain cells, the energy 
yie oat. none, to the Panas, or to another region of the mind, 
