Let it not be supposed that the author, in this work, assumes a belligerent attitude towards the members of the medical profession. Although anxious to modify and elevate their estimate of electricity as a remedial agent, and to improve their methods of using it, he has no sympathy with those who profess to believe, and who assert, that medicines of the apothecary never effect the cure of disease; that where they are thought to cure, they simply do not kill; and who contend that the patient would have recovered quicker and better to have taken no medicine at all. He knows that such allegations are false, as they are extravagant; and so does every candid and unprejudiced observer whose experience has given him ordinary opportunities to judge. The writer believes it can be perfectly demonstrated that the advancement of medical science in modern times--say within the last two or three hundred years--has served to essentially prolong the average term of human life. The world owes to medical instructors and practitioners a debt of gratitude which can never be paid. Their laborious and often perilous research in the fields of their profession, and their untiring assiduity in the application of their science and skill to the relief of human suffering, entitle them to a degree of confidence and affectionate esteem which few other classes of public servants can rightly claim. For one, the author of this little book most sincerely concedes to them, as a body, his confidence, his sympathy, and his grateful respect. And the most that he is willing to say to their discredit, (if it be so construed), is that he regards them as having not yet attained _perfection_ in their high profession, and as not being generally as willing as they should be to examine fairly into the alleged merits of remedial agents and improved principles of practice, (claimed to be such), when brought forward by intelligent, cultivated and respectable men, outside of "the regular profession." This is said at the same time that the author gives much weight to their commonly offered defense, viz: that, in the midst of professional engagements, they have not always the time to spare for such examination; and that, since the most of alleged improvements in the healing art, particularly of those introduced by persons who have not received a regular medical education, sooner or later prove themselves to be worthless, the _presumption_--though not the _certainty_--is, whenever a new agent, or a new method or principle is proposed by an "outsider," that this, too, if not willful charlatanism, is a mistake; and therefore, the sooner it comes to an end the better it will be for the public health, and that neglect is the surest way to kill it.