De morborum temporibus, Principum Medicorum Aphorismoi

11. In the first accession, a single matter putrefies: in subsequent ones, more; among which is blood.
12. Hence, in intermittent fevers as well (unless some other factor prevents it), blood should be drawn.
13. Unhealthy diseases have only a particular beginning, those in which the matter is more copious or thicker, or a large inflammation is joined to it.
14. They also have an increase, in which there is a vehemence of things contrary to nature: if this is less there, they also have a state.
15. That a patient can die in a particular decline is held by Galen, and reason seems to persuade it.
16. But following the most distinguished Mercurialis, I do not believe a patient can die in a true particular decline.
17. I call it true, according to Averroes, in which the strength remains valid after the disease is overcome: false, which is rather a decline of strength than of the disease.

XVI.

The times in the accession and period are diagnosed from the heat, as essentially inherent: from changed quality, such as the color of the face: from changed excretion, such as urine: from impaired action, such as the pulse.
1. Instead of the pulse, Rhasis and Avicenna recommend respiration to beginners.
2. Which Hippocrates also valued so highly that, intent on this alone, he seems to have spurned the pulse.
3. Ἐπισυμβάσια concurrence/supervention is used expertly for the beginning, both of the accession and the period: and sometimes only for the span of the accession.
4. This latter is called the beginning of the beginning: and the cause is either nothing or obscure.
5. In proportioned fevers of the most remote veins, the times are evidently distinct: in those not so remote, the beginning, the inequality, and the increase are confused.
6. From the heat of the putrefying matter in a part, a flow occurs into it from the rest, which, deprived of blood and heat, are cooled at the beginning by privative cold, not positive.
7. Shivering is neither the beginning of an accession nor of a fever, but a sign of the beginning of an accession (to which it is joined) and of the fever following the shivering. Fernel, book 4, chap. 1, and Altimarus.
8. Yet there is a shivering that is none of these, such as when a κρίσις crisis supervenes.
9. In the increase, febrile heat, according to Galen, expands simultaneously and gradually, and is equally expanded: the former understood regarding the degree, the latter regarding the equality of the parts.

XVII.

The affection of the period specifically termed is the Type, that is, the order of intension and remission encompassed by the period.
1. The type exists in certain other diseases, but especially in fevers, except for continuous ones that never remit, and those that are irregular.