Last, but by no means least, comes the matter of solicitation of the bowels. In this case regularity in solicitation will invariably produce regularity in movement. The bowels should be solicited every morning, soon after rising, and every night just before retiring. We only wish that we could impress every one of our readers with the importance of this practice, and of the immense benefit of regularity in the pursuance of it. Just as the stomach acquires the habit of expecting food when regularly supplied to it at stated intervals, even so will the bowels respond to solicitation if regularity be persisted in. Nature is inexorably opposed to caprice. She executes all her processes in an orderly manner, and if not interfered with, with the greatest regularity, and if man will only co-operate with her by strict regularity in the important duties previously mentioned, the result will be a surprise to him in the form of renewed health and vigor. He will have an unclouded mind, and be ready to face the trials of everyday existence with a courage that nothing can daunt. But Nature demands an accurate accounting. Man thinks but little of the drafts he is continually making upon his vitality, but sooner or later the account will be presented, and payment exacted in full. There is no such thing as vicarious payment. The debtor must pay in person, and it therefore behooves every man to watch the debit side of his life’s ledger, and make a daily balance of his account with Nature. PART VIII. TREATMENT OF DISEASE. HEART DISEASE. There are numerous affections of the heart, divided into two classes--organic and functional, the former being the more serious; but it is safe to say that seventy-five per cent. of cases belong in the latter class. The most common, and at the same time most serious, of the organic troubles, are pericarditis (inflammation of the heart-envelope), and valvular insufficiency (imperfect closure of the valves). The functional disturbances are (almost without exception) due to digestive difficulties. In the first class, if the case is well advanced and the patient past the meridian of life, recovery is improbable, although life may be considerably prolonged. The second class of cases can be cured, with reasonable certainty, by removing the cause. TREATMENT.