The following chapters were contributions to Health--a monthly magazine published in New York City. Certain peculiarities of form and considerable repetition of statement--both of which the reader cannot fail to notice--are owing to the fact that about two-thirds of the chapters were written under the caption "Auto-genetic Poisons in the Intestinal Canal and their Auto-infection." In revising these contributions for book form I have given to each chapter a caption of its leading thought; but I am convinced that repetition of some of the matters treated, especially if the repetition be in a somewhat different connection, is not such a very bad thing.
causes which may be the means of exciting inflammation of the anus and rectum later in life; but it is the writer's opinion that the cause can be traced back to infancy or early childhood, and that accidents or imprudence in after years merely excite an already-existing chronic inflammation. Piles, fissure, itching pockets, tabs, prolapse, abscesses, fistulæ, etc., are only the outcome and symptoms of a chronic disease which has incubated for fifteen, twenty or more years. None of this list of troubles produces constipation. It is the inflammation located at the middle portion of the rectum and extending into the sigmoid flexure that causes constipation; that protean monster which deranges more lives with nervousness than any other pathological condition to which the flesh of man is heir!
THE PHYSICS OF DIGESTION AND EGESTION.
A tree is simply an extension from its roots; and, in an analogous manner, man's b