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nothing remains but the small portion of its trunk from

which the two arms, with their nerves, proceed, and if,

under these circumstances, the warty prominences be touched,

the two arms will then fly together as if they were moved

by a spring, and this remarkable and complex response

to a stimulus must take place altogether without the inter-

vention of sensation.

But in all these instances of reflex action, the stimulus

applied should be regarded as the occasion, not the cause, of

the movements in question. They must, it seems to us, be

due to powers and energies latent in the organism, which

powers the stimulus serves to make manifest.

Other actions may take place in us which resemble reflex

action in so far as they take place independently of the will,

and, indeed, in spite of all the voluntary efforts we can make,

while yet they differ from reflex action because they occur as

consequences of sensations distinctly felt. We have already

seen how impossible it is for us to impede our respiratory

actions after they have been suspended long enough to give

rise to peculiarly distressing feelings. Similarly, if an object,

not too large, be placed very far back in the mouth, it must

be swallowed, and we cannot help it. But the presence of

the object is all the time distinctly felt. Such actions are

termed " sensori- motor" actions, to distinguish them from

reflex ones in which sensations do not intervene.

It cannot be doubted that different regions of the brain are

specially connected with our experience of different sensa-

tions, imaginations, and sense -perceptions, and it is also

certain that different parts of it are organs for originating

different motions and combinations of movements. But

though very much has been done towards determining these

connexions, a vast deal more remain quite uncertain, and,

for our purpose here, such localizations are indifferent, and

it is enough to note the fact that there are various central

nothing remains but the small portion of its trunk from

which the two arms, with their nerves, proceed, and if,

under these circumstances, the warty prominences be touched,

the two arms will then fly together as if they were moved

by a spring, and this remarkable and complex response

to a stimulus must take place altogether without the inter-

vention of sensation.

But in all these instances of reflex action, the stimulus

applied should be regarded as the occasion, not the cause, of

the movements in question. They must, it seems to us, be

due to powers and energies latent in the organism, which

powers the stimulus serves to make manifest.

Other actions may take place in us which resemble reflex

action in so far as they take place independently of the will,

and, indeed, in spite of all the voluntary efforts we can make,

while yet they differ from reflex action because they occur as

consequences of sensations distinctly felt. We have already

seen how impossible it is for us to impede our respiratory

actions after they have been suspended long enough to give

rise to peculiarly distressing feelings. Similarly, if an object,

not too large, be placed very far back in the mouth, it must

be swallowed, and we cannot help it. But the presence of

the object is all the time distinctly felt. Such actions are

termed " sensori- motor" actions, to distinguish them from

reflex ones in which sensations do not intervene.

It cannot be doubted that different regions of the brain are

specially connected with our experience of different sensa-

tions, imaginations, and sense -perceptions, and it is also

certain that different parts of it are organs for originating

different motions and combinations of movements. But

though very much has been done towards determining these

connexions, a vast deal more remain quite uncertain, and,

for our purpose here, such localizations are indifferent, and

it is enough to note the fact that there are various central