Now none of these rules is always to be followed. For it may be proper to give food on the first day, it may on the second, it may on the third, it may not before the fourth or fifth; it may after one fit, it may after two, it may after several. For the qualities of the distemper, constitution, air, age, and season of the year make some difference. And no time can be universally fixed in things so widely different from each other. In a distemper that weakens more, food must be sooner allowed; also in an air that is more dissipating. Upon this account in Africa for no day it seems proper to prescribe fasting. It should be given also sooner to a boy, than a young man; more quickly in summer, than winter. This one thing must be practised always and every where, that a physician sitting by should now and then observe the strength of the patient, and as long as that continues, encounter the disease by abstinence; if he begins to apprehend weakness, support him by food. For it is his business to be careful neither to load the patient by superfluous matter, nor when he is weaker, to kill him by fasting. And this I find in Erasistratus, who though he did not direct, when the belly, when the body itself was to be evacuated, yet by saying that these were to be regarded, and that food was to be given, when the body stood in need of it, has plainly enough shewn, that it ought not to be given, while there w as a sufficient quantity of strength, and that care should be taken, that it was not too much exhausted. From these things it may be inferred, that many people cannot be attended by one physician; and that the man to be trusted is he, that knows his profession, and is not much absent from the patient. But they, that practise only from views of gain, because their profits arise in proportion to the number of patients, readily fall in with such rules, as do not require close attendance; as in this very case. For it is easy even for such, as seldom see the patient, to count the days and the fits: but it is necessary for him to sit by his patient, who would form a true judgment what is alone fit to be done; when he will be too weak unless he get food. In most people however the fourth day is usually the most proper for beginning to give food. But there is still another doubt about the days themselves, because the ancients chiefly regarded the odd days, and called them critical[BC], as if on these a judgment was to be formed concerning the patients. These days were the third, fifth, seventh, ninth, eleventh, fourteenth, and twenty-first; so that the greatest influence was attributed to the seventh, next to the fourteenth, and then to the twenty-first. And therefore with regard to the nourishment of the sick, they waited for the fits of the odd days: then afterwards they gave food, expecting the approaching fits to be easier; insomuch that Hippocrates, if the fever had ceased on any other day, used to be apprehensive of a relapse. [BC] κρισίμοι.