Chapter III

In meeting the uncontrollable causes of disease the special influence of season deserves particular regard. It should always be remembered that, other things being equal, during winter the body loses, during summer gains in weight. Further, it should be remembered that these changes are abrupt: that usually the loss commences, sharply, in September and lasts until April, and that the gain commences in April and lasts until September. In September, though the weather even be warm, it is right, therefore, to add to the clothing and to commence a little excess of food. In summer it is right not only to reduce the clothing, but to eat less food than in winter.