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Sudden alternations of heat and cold are dangerous (especially to the young and the aged). Therefore, clothing, in quantity and quality, should be adapted to the alternations of night and day, and of the seasons; and drinking cold water when the body is hot, and hot tea and soups when cold, are productive of many evils. 924. Summary. Moderation in eating and drinking, short hours of labour and study, regularity in exercise, recreation, and rest, cleanliness, equanimity of temper and equality of temperature,--these are the great essentials to that which surpasses all wealth, health of mind and body. 925. Homoeopathy. 926. Principle of Homoeopathy. As homoeopathy is now practised so widely and, indeed, preferred to the older system in many families, the Domestic Pharmacopoeia could scarcely lay claim to be considered complete without a brief mention of the principal remedies used and recommended by homoeopathic practitioners, and the disorders for which these remedies are specially applicable. The principle of homoeopathy is set forth in the Latin words "similia similibus curantur," the meaning of which is "likes are cured by likes." The meaning of this is simply that the homoeopathist in order to cure a disease, administers a medicine which would produce in a perfectly healthy subject, symptoms like, but not identical with or the same as, the symptoms to counteract which the medicine is given. The homoeopathic practitioner, therefore, first makes himself thoroughly acquainted with the symptoms that are exhibited by the sufferer; having ascertained these, in order to neutralize them and restore the state of the patient's health to a state of equilibrium, so to speak, he administers preparations that would produce symptoms of a like character in persons in good health.