gaining it with the second.

The subject to the consideration of which I would now solicit your
attention does certainly appear likely to lure us on towards the
flattering land of speculation, but bearing in mind what I have just
said, I will beware of quitting the department of natural science to
which I have devoted myself hitherto. I shall, however, endeavour to
attain its highest point, so as to take a freer view of the
surrounding territory.

It will soon appear that I should fail in this purpose if my remarks
were to confine themselves solely to physiology. I hope to show how
far psychological investigations also afford not only permissible,
but indispensable, aid to physiological inquiries.

Consciousness is an accompaniment of that animal and human
organisation and of that material mechanism which it is the province
of physiology to explore; and as long as the atoms of the brain
follow their due course according to certain definite laws, there
arises an inner life which springs from sensation and idea, from
feeling and will.

We feel this in our own cases; it strikes us in our converse with
other people; we can see it plainly in the more highly organised
animals; even the lowest forms of life bear traces of it; and who can
draw a line in the kingdom of organic life, and say that it is here
the soul ceases?

With what eyes, then, is physiology to regard this two-fold life of
the organised world? Shall she close them entirely to one whole side