on and thought. Within
experience mind is found in constant and definite association with that
highly complex and peculiar disposition of matter called a living brain.
The size and elaboration of this peculiar structure throughout the
animal kingdom stand in conspicuous proportion to the degree of
intelligence displayed; while the impairment of this structure, whether
by congenital defect, mutilation, anaemia, decay, or appropriate poison,
entails corresponding impairment of mental processes. Thus much being
established, no reasonable man can hesitate in believing the relation
between neurosis and psychosis to be a constant and concomitant
relation, so that the step between this, and regarding it as a causal
relation, seems indeed a small one. For, in all matters of physical
inquiry, whenever we have proved a constant relation of concomitancy in
a sequence _A B_, we call _A_ the cause of _B_; and, therefore, it has
been frequently said that the evidence of causation between neurosis and
psychosis is recognized causation. Lastly, to fortify this hypothesis,
materialists point to the doctrine of the conservation of energy, which
is supplied by the science of physics as a sort of buttress in this
matter to the teachings of physiology. For, as this doctrine compels us
to believe that the chain of physical causation involved in cerebral
processes can nowhere be broken or deflected _ab extra_, we are
compelled to believe that the mental processes, which are correlatively
associated with these cerebral processes, can nowhere escape from 'the
charmed circle of the forces,' so that whether we look to the detailed
teachings of physiology, or to the more general teachings of physics, we
alike perceive that natural science appears to leave no locus for mind
other than as a something which is in some way a result of motion.

The position of Materialism being thus at first sight so naturally
strong, and having been in recent years so fortified by the labours of
physiology, it is not surprising that in the present generation
Materialism should be in the ascendant. It is the simple truth, as a
learned and temperate author, speaking from the side of theology, has
recently said, that

'Materialism is a danger to which individuals and societies will
always be more or less exposed. The present generation, however,
and especially the generation which is growing up, will obviously
be very especially exposed to it; as muc