In respect of the commencement and predispositions of the disease, it is now well known--first, that in this country it habitually begins with diarrhœa of a painless and apparently trivial character; secondly, that diarrhœa, however produced, is, of all known personal conditions, the one most likely to invite an attack of Cholera at times when that disease is epidemic; thirdly, that during the prevalence of Cholera, side by side with it in a district, there is always a vast amount of epidemic diarrhœa, apparently constituting slighter degrees or earlier stages of the same disease; that this condition is just as amenable to treatment as the confirmed collapse of Cholera is utterly the opposite; and--since we can never say how incurable a few hours may render this insidious symptom, that its immediate arrest is a consideration of vital importance. Precautions against causing diarrhœa to oneself by errors of diet will vary somewhat with different individuals. Every person of ordinary discretion knows the habits of his own body, and can be tolerably confident, within certain limits of food, that he gives himself no occasion of sickness. He remembers articles of diet, which his neighbour perhaps may innocently indulge in, but which to himself are the occasion of inward disorder--of purging or vomiting, ‘bilious attack’ or nettle rash, headache, nightmare, or some other inconvenience. This knowledge fixes the limits which it primarily behoves him to regard; taking such food only into his body as experience has shown best to agree with it; and adhering to this course, without panic as to particular accustomed articles, and without abrupt discontinuance of old harmless habits. Apart from personal peculiarities, the chief dangers of diet appear to lie as follows: first, in those excesses of meat and drink, which (especially under circumstances of fatigue) occasion sickness to the stomach, or an increased labour of digestion; secondly, in taking food, solid or fluid, which is midway in some process of chemical transition--half-fermented beer and wine, water containing organic matters, meat and game and venison no longer fresh and not completely cooked, fish and shell-fish, in any state but the most perfect freshness, fruit or vegetables long-gathered or badly kept, and the like; thirdly, in a profusion of cold sour drink; fourthly, in partaking largely of those articles of diet which habitually, or by reason of imperfect cooking, pass unchanged through the intestinal canal; and fifthly, in the indiscreet use of purgative medicines, or in taking any article of diet which is likely to produce the same effect.