"The faculty of thinking," says Dr.Priestley, "in general ripens and comes to maturity with the body; it is also observed to decay with it,"-- "If the brain be affected, as by a blow on the head, by actual pressure within the skull, by sleep, or by inflammation, the mental faculties are universally affected in proportion.

Likewise, as the mind is affected in consequence of the affections of the body and brain, so the body is liable to be reciprocally affected by the affections of the mind, as is evident in the visible effects of all-strong passions,--hope or fear, love or anger, joy or sorrow, exultation or despair.

These are certainly irrefragable arguments that it is properly no other than _one and the same thing_ that is subject to these affections."[155] Mr.Atkinson urges the same reason.

"The proof that mind holds the same relation to the body that all other phenomena do to material conditions, may be found," he tells us, "in the whole circumstances of man's existence, his origin and growth; the faculties following the development of the body in man and other animals; the direction of the faculties being influenced by surrounding circumstances; the desires, the will, the hopes, the fears, the habits, and the opinions, being effects traceable to causes,--to natural causes,--and becoming the facts of History and Statistics.

We observe the influence of climate, of sunshine and damp, of wine and opium and poison, of health and disease." ...