And when I speak thus separately of the mind and body, it must be remembered, as already said, that there is no strict line between them; but probably every affection or passion of the mind has its correlative in the condition of the body--though this latter may or may not be easily observable. Gluttony _is_ a fever of the digestive apparatus. What is a taint in the mind is also a taint in the body. The stomach has started the original idea of becoming itself the centre of the human system. The sexual organs may start a similar idea. Here are distinct threats, menaces made against the central authority--against the Man himself. For the man must rule or disappear; it is impossible to imagine a man presided over by a Stomach--a walking Stomach, using hands, feet, and all other members merely to carry it from place to place, and serve its assimilative mania. We call such a one an Hog. [And thus in the theory of Evolution we see the place of the hog, and all other animals, as fore-runners or off-shoots of special faculties in Man, and why the true man, and rightly, has authority over all animals, and can alone give them their place in creation.] So of the Brain, or any other organ; for the Man is no organ, resides in no organ, but is the central life ruling and radiating among all organs, and assigning them their arts to play. Disease then, in body or mind, is from this point of view the break-up of its unity, its entirety, into multiplicity. It is the abeyance of a central power, and the growth of insubordinate centres--life in each creature being conceived of as a continual exercise of energy or conquest, by which external or antagonistic forces (and organisms) are brought into subjection and compelled into the service of the creature, or are thrown off as harmful to it. Thus, by way of illustration, we find that plants or animals, when in good health, have a remarkable power of throwing off the attacks of any parasites which incline to infest them; while those that are weakly are very soon eaten up by the same. A rose-tree, for instance, brought indoors, will soon fall a prey to the aphis--though when hardened out of doors the pest makes next to no impression on it. In dry seasons when the young turnip plants in the fields are weakly from want of water the entire crop is sometimes destroyed by the turnip fly, which then multiplies enormously; but if a shower or two of rain come before much damage is done the plant will then grow vigorously, its tissues become more robust and resist the attacks of the fly, which in its turn dies. Late investigations seem to show that one of the functions of the white corpuscles in the blood is to devour disease-germs and bacteria present in the circulation--thus absorbing these organisms into subjection to the central life of the body--and that with this object they congregate in numbers toward any part of the body which is wounded or diseased. Or to take an example