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These cases we point to as formidable mementos, monumenta sacra, of those sudden catastrophes which either ignorance of what concerns the health, or neglect in midst of knowledge, may produce. Any mode of life in London, or not in London, which trains the nerves to a state of permanent irritation, prepares a nidus for disease; and unhappily not for chronic disease only, but for disease of that kind which finishes the struggle almost before it is begun. In such a state of habitual training for morbid action, it may happen–and often has happened–that one and the same week sees the victim apparently well and in his grave.

These, indeed, are extreme cases: though still such as threaten many more than they actually strike; for, though uncommon, they grow out of very common habits. But even the ordinary cases of unhealthy action in the system, are sufficient to account for perhaps three-fourths of all the disquiet and bad temper which disfigure daily life. Not one man in every ten is perfectly clear of some disorder, more or less, in the digestive system–not one man in fifty enjoys the absolutely normal state of that organ; and upon that depends the daily cheerfulness, in the first place, and through that (as well as by more direct actions) the sanity of the judgment. To speak strictly, not one man in a hundred is perfectly sane even as to his mind. For, though the greater disturbances of the mind do not take place in more than one man of each thousand,[Footnote: in several nations that has been found to be the average proportion of the insane. But this calculation has never been made to include all the slighter cases. It is not impossible that at some periods the whole human race may have been partially insane.] the slighter shades that settle on the judgment, which daily bring up thoughts such as a man would gladly banish, which force him into moods of feeling irritating at the moment, and wearing to the animal spirits,–these derangements are universal.

From the greater alike and the lesser, no man can free himself but in the proportion of his available knowledge applied to his own animal system, and of the surrounding circumstances, as constantly acting on that system. Would we, then, desire that every man should interrupt his proper studies or pursuits for the sake of studying medicine? Not at all: nor is that requisite. The laws of health are as simple as the elements of arithmetic or geometry. It is required only that a man should open his eyes to perceive the three great forces which support health.

They are these: 1. The blood requires exercise: 2. The great central organ of the stomach requires adaptation of diet: 3. The nervous system requires regularity of sleep. In those three functions of sleep, diet, exercise, is contained the whole economy of health. All three of course act and react upon each other: and all three are wofully deranged by a London life–above all, by a parliamentary life. As to the first point, it is probable that any torpor, or even lentor in the blood, such as scarcely expresses itself sensibly through the pulse, renders that fluid less able to resist the first actions of disease. As to the second, a more complex subject, luckily we benefit not by our own brief experience exclusively; every man benefits practically by the traditional experience of ages, which constitutes the culinary experience in every land and every household. The inheritance of knowledge, which every generation receives, as to the salubrity of this or that article of diet, operates continually in preventing dishes from being brought to table. Each man’s separate experience does something to arm him against the temptation when it is offered; and again, the traditional experience far oftener intercepts the temptation. As to the third head, sleep, this of all is the most immediately fitted by nature to the relief of the brain and its exquisite machinery of nerves:–it is the function of health most attended to in our navy; and of all it is the one most painfully ravaged by a London life.