17. With regard to the states of the weather which continue but for a day, that which is northerly, braces the body, giving it tone, agility, and color, improves the sense of hearing, dries up the bowels, pinches the eyes, and aggravates any previous pain which may have been seated in the chest. But the southerly relaxes the body, and renders it humid, brings on dullness of hearing, heaviness of the head, and vertigo, impairs the movements of the eyes and the whole body, and renders the alvine discharges watery.
18. With regard to the seasons, in spring and in the commencement of summer, children and those next to them in age are most comfortable, and enjoy best health; in summer and during a certain portion of autumn, old people; during the remainder of the autumn and in winter, those of the intermediate ages.
19. All diseases occur at all seasons of the year, but certain of them are more apt to occur and be exacerbated at certain seasons.
20. The diseases of spring are, maniacal, melancholic, and epileptic disorders, bloody flux, quinsy, coryza, hoarseness, cough, leprosy, lichen alphos, exanthemata mostly ending in ulcerations, tubercles, and arthritic diseases.
21. Of summer, certain of these, and continued, ardent, and tertian fevers, most especially vomiting, diarrhoea, ophthalmy, pains of the ears, ulcerations of the mouth, mortifications of the privy parts, and the sudamina.
22. Of autumn, most of the summer, quartan, and irregular fevers, enlarged spleen, dropsy, phthisis, strangury, lientery, dysentery, sciatica, quinsy, asthma, ileus, epilepsy, maniacal and melancholic disorders.
23. Of winter, pleurisy, pneumonia, coryza, hoarseness, cough, pains of the chest, pains of the ribs and loins, headache, vertigo, and apoplexy.
24. In the different ages the following complaints occur: to little and new-born children, aphthae, vomiting, coughs, sleeplessness, frights inflammation of the navel, watery discharges from the ears.
25. At the approach of dentition, pruritus of the gums, fevers, convulsions, diarrhoea, especially when cutting the canine teeth, and in those who are particularly fat, and have constipated bowels.
26. To persons somewhat older, affections of the tonsils, incurvation of the spine at the vertebra next the occiput, asthma, calculus, round worms, ascarides, acrochordon, satyriasmus, struma, and other tubercles (phymata), but especially the aforesaid.
27. To persons of a more advanced age, and now on the verge of manhood, the most of these diseases, and, moreover, more chronic fevers, and epistaxis.
28. Young people for the most part have a crisis in their complaints, some in forty days, some in seven months, some in seven years, some at the approach to puberty; and such complaints of children as remain, and do not pass away about puberty, or in females about the commencement of menstruation, usually become chronic.
29. To persons past boyhood, haemoptysis, phthisis, acute fevers, epilepsy, and other diseases, but especially the aforementioned.
30. To persons beyond that age, asthma, pleurisy, pneumonia, lethargy, phrenitis, ardent fevers, chronic diarrhoea, cholera, dysentery, lientery, hemorrhoids.
31. To old people dyspnoea, catarrhs accompanied with coughs, dysuria, pains of the joints, nephritis, vertigo, apoplexy, cachexia, pruritus of the whole body, insomnolency, defluxions of the bowels, of the eyes, and of the nose, dimness of sight, cataract (glaucoma), and dullness of hearing.