It seems as if one might say with certainty 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.