As the skin performs the double function, of drawing nourishment from the air, and exhaling the phlogisticised air of the diseased matter and worn-out atoms of the body, it follows that the true art of curing, must be to endeavour to restore these two functions. Hydropathy causes the ejection of diseased matter and revives the activity of the skin. Dr. Johnson observes, "Discomforts are the necessary whips and spurs which keep the living energies awake; whilst comforts operate upon us like opiates: since to acquire a 'comfort' is only to remove a discomfort; and to remove what keeps us awake, is the same thing as to administer what will send us to sleep. The indulgences, therefore, wherewith even young and healthy men indulge themselves; the 'comforts,' as they call them, of flannel, warm clothing, closed doors, carpeted rooms, soft beds, hot food, are infinitely worse than absurd; because the opposites of all these luxuries, so far from being injurious to health, are absolutely _necessary_ to it. We actually kill ourselves with comforts." XXVIII.--DRUGS. "Thus with our hellish drugs, Death's ceaseless fountains In these bright vales, o'er these green mountains Worse than the very plague we raged. I have myself to thousands poison given, And hear their murderer praised as blest by heaven, Because with Nature strife he waged." GÖETHE'S FAUST. The influence of habit and custom is such, that it is difficult to arouse inquiry, when the result is calculated to derange the existing order of things. Mr. D'Israeli observes, "Could we conceive that man had never discovered the practice of washing his hands, but cleansed them as animals do their paws, he would for certain have ridiculed and protested against the inventor of soap, and as tardily, as in other matters, have adopted the invention." All change, however beneficial, is attended with trouble; and we therefore adopt the motto, "Whatever is, is right." This very motto is the key to our method of cure--as it is to that of every other great moral truth. Yet, to quote the words of Rausse, "We do not take this in the sense of the philosophy of our days, or in that of the German philosopher, Hegel, for then we must consider falsehood and assassination to be good. Rather would we take these words in the sense in which they were first proclaimed by the philosophy of Geneva, in the sense in which the _first citizen_ used them for the foundation of his truths; thus, that which is produced by nature is good; all inclinations, all impulses of men derived from nature, are good; and every mis-usage of nature is an outrage which she punishes with misery and pain. All the principles of the art of curing at Gräfenberg, attested as they are by thousands, are dictated by that instinct which nature has given to every human being as his inheritance."