tainty that if a medicine could be
found to immortalize the body there would be no fear of its [not] being
accompanied by the immortality of the mind. But the immortality of the
mind by no means seems to infer the immortality of the body. On the
contrary, the greatest conceivable energy of mind would probably
exhaust and destroy the strength of the body. A temperate vigour of
mind appears to be favourable to health, but very great intellectual
exertions tend rather, as has been often observed, to wear out the
scabbard. Most of the instances which Mr Godwin has brought to prove
the power of the mind over the body, and the consequent probability of
the immortality of man, are of this latter description, and could such
stimulants be continually applied, instead of tending to immortalize,
they would tend very rapidly to destroy the human frame.

The probable increase of the voluntary power of man over his animal
frame comes next under Mr Godwin's consideration, and he concludes by
saying, that the voluntary power of some men, in this respect, is found
to extend to various articles in which other men are impotent. But this
is reasoning against an almost universal rule from a few exceptions;
and these exceptions seem to be rather tricks, than powers that may be
exerted to any good purpose. I have never heard of any man who could
regulate his pulse in a fever, and doubt much, if any of the persons
here alluded to have made the smallest perceptible progress in the
regular correction of the disorders of their frames and the consequent
prolongation of their lives.

Mr Godwin says, 'Nothing can be more unphilosophical than to conclude,
that, because a certain species of power is beyond the train of our
present observation, that it is beyond the limits of the human mind.' I
own my ideas of philosophy are in this respect widely different from Mr
Godwin's. The only distinction that I see, between a philosophical
conjecture, and the assertions of the Prophet Mr Brothers, is, that one
is founded upon indications arising from the train of our present
observations, and the other has no foundation at all. I expect that
great discoveries are yet to take place in all the branches of human
science, particularly in physics; but the moment we leave past
experience as the foundation of our conjectures concerning the future,
and, still more, if our conjectures absolutely contradict past
experience, we are thrown upon a wide field of uncertainty