The facts I am about to enumerate relate to nutritive needs only; but we shall find their equivalents or analogies in the other manifestations of emotional life. We can, therefore, already generalise so far as to say that when abnormal or morbid tendencies, however absurd or violent, show themselves, their satisfaction involves pleasure, their non-satisfaction, pain. Where the normal man, with normal tendencies, places pleasure, the abnormal man, with abnormal tendencies, places pain. Conversely, that which the man with normal tendencies feels to be agreeable, the man with abnormal tendencies feels to be unpleasant. Pleasure and pain follow the changes of tendency, as the shadow follows the movements of the body. Let us look at the facts. We have at this moment to do only with the perversion of instincts relative to nutrition. Pregnancy produces during the first few months digestive, circulatory, secretory disturbances, incomplete nutrition, and at the same time those grotesque aberrations of appetite, those depraved tastes, which every one knows, and of which the catalogue would be endless. Not to digress from the subject of this chapter, I say nothing of those morbid tendencies of another kind which show themselves at the same time in some women—homicidal or suicidal tendencies, aversion to husband, kleptomania, etc. In anæmic, chlorotic, hysteric, and other subjects, if badly nourished, we sometimes find an acute pleasure in earth, straw, tobacco, chalk, sand, charcoal, etc., and an aversion to the most savoury foods.[129] Footnote 129: