But as the fever and the manner of its remission direct to the proper seasons for food and drink, so it is not very easy to know, when the patient has a fever upon him, when he is better, or when his strength fails; without which these cannot be properly administered. For we principally trust the pulse, a most fallacious mark; because this is often slower or more quick from the age, and sex, and difference of constitutions. And generally when the body is in good enough health, if the stomach be weak, sometimes also in the beginning of a fever, it rises and sinks; so that the person may seem to be weak, when he can very well stand a severe fit that is just approaching. On the other hand, the pulse is often raised, and the vessels relaxed by the influence of the sun, and the bath, and exercise, and fear, and anger, and any other passion of the mind. So that, when a physician first comes in, the anxiety of the patient, doubtful how he may think him, accelerates the pulse. For this reason it is the business of a skilful physician not to take hold of the patient’s arm with his hand, as soon as he comes in; but first to sit down with a cheerful countenance, and ask him how he does; and if he has any apprehension, to encourage him with plausible discourse: then to apply his hand to his wrist(5). Now if the sight of the physician quickens the pulse, how easily may a thousand other accidents disorder it! Another mark, to which we trust, is heat, equally deceitful; for this is excited by warmth, labour, sleep, fear, and anxiety. Wherefore it is fit to consider those things; but not to trust entirely to them. And we may at once assure ourselves that a person has no fever, whose pulse moves regularly, and who has such a heat as is common to people in health; and that a fever is not necessarily breeding, when there is heat and motion; but only with these circumstances, if the surface of the skin, be unequally dry; if there be a heat in the forehead, and at the same time arising from the internal part of the præcordia; if the breath rushes out of the nostrils very hot; if the colour be changed either for a redness or an unusual paleness; if the eyes are heavy, and either very dry or somewhat moist; if when a sweat comes on, it is partial; if the pulse does not beat at equal intervals. Upon this account the physician ought to sit down neither in the dark, nor at the patient’s head, but in a light place opposite to him, that he may take all the marks from the countenance of the patient as he lies.