So, likewise, are there numerous, acute diseases of a milder character which are easily and unmistakably recognized without the possession of great medical knowledge, and which readily yield to plain, simple, medical treatment which is within the ready reach of all who strive to acquaint themselves with the rudiments of medical science. But in sudden and painful attacks of acute disease, life may be suddenly and unexpectedly jeopardized, and immediate relief prove necessary. While under these circumstances the prompt application of such domestic treatment as good common-sense may dictate, guided by a knowledge of those first principles of medical learning which we shall hereafter endeavor to make plain, may result in speedy and happy relief, yet at the same time there should be no delay in summoning a competent physician to the bedside of the sufferer. Then, and not the least important, there are the various chronic or lingering diseases, from all of which few individuals indeed, who pass the meridian of life, entirely escape. In this class of ailments there is generally no immediate danger, and, therefore, time may be taken by the invalid for studying his disease and employing those remedies which are best suited for its removal. Or, if of a dangerous or complicated character, and, therefore, not so readily understood, he may consult either personally or by letter, some learned and well-known physician, who makes a specialty of the treatment of such cases, and whose large experience enables him to excel therein. In consideration, therefore, of the foregoing facts, we deem it most profitable for our readers that Part Fourth of this volume should be arranged in the following manner: The milder forms of uncomplicated, acute diseases, which may be readily and unmistakably recognized, and successfully managed without professional aid, will receive that attention which is necessary to give the reader a correct idea of them, and their proper remedial treatment. We shall devote only such attention to the severe and hazardous forms of acute diseases as is necessary in order to consider their initial stage, with their proper treatment, not attempting to trace their numerous complications, or portray the many pathological conditions which are liable to be developed. For, even by devoting much space to the latter, we could not expect to qualify our unprofessional readers for successfully treating such obscure and dangerous conditions.