Theses hasce

so that an exquisite fever may be produced simply and exactly.

13. Namely, that the time be warmer, the body youthful, of a hot and dry temperament, and all other things tending toward hot and dry. There must also be a just quantity of bile, provided it does not exceed seven periods, nor last beyond twelve equinoctial hours.

14. Now, as for the place or focus of the putrefying matter, since it occurs outside the veins, it can be one or more in number, such as the stomach, the intestines, the liver, and similar parts, such that one may establish multiple differences of tertian fever by reason of the place.

15. But indeed, since no disease can be correctly cured without knowledge of its causes, it will be worth the effort to investigate the causes before we come to the cure.

16. Galen enumerates two species of these: the one prokatarktika and prokatarchonta pre-initiating or external, commonly called primitive; the other proegoumena leading or antecedent.

17. Among external causes, any excess in the six non-natural things is counted; by its evil effect, a more copious bile arises, which renders the temperament hotter and drier. The internal cause, however, is none other than putrid bilious matter.

18. This often arises from a defect of natural action in the liver or stomach, and sometimes also because of an external error or corrupt bilious food.

19. A vitiated action implies either that the faculty of those same parts is damaged, or it happens again through some external error.

20. The faculty is damaged if it is either weakened or hindered. It is weakened when the liver, or sometimes the stomach as well, suffers from a hot and dry intemperies. It is hindered, however, by obstruction, which a multitude of matter, or its viscosity and thickness, has generated.

21. For the liver, laboring under obstruction, conceives an igneous heat, which is the most suitable instrument for this morbid bile.

22. Now, if the food is also bilious by its own nature, porraceous, ferruginous, and blue bile can also be born in the stomach.

23. For the same reasons, bilious matter, when it redundantly gathers in the body and cannot be regulated by the native heat, putrefies.

24. Signs