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THere are two General Causes of Impostumes, Fluxion, and Congestion:* 1.1 Defluxions are occasioned, either by the part sending, or receiving; the part sending discharges it self of the humors, because the expulsive faculty resident in that part is provoked to expel them; moved thereto, either by the troublesomeness of their quantity or quality. The part re∣ceiving
draws, and receives occasion of heat, pain, weakness, (whether natural, or accidental) openness of the passages, and lower situation.
* 1.2The causes of heat, in what part soever it be, are commonly three, as, all immoderate motion (under which frictions are also contained); external heat, either from fire, or Sun; and the use of acrid meats and medicines.
* 1.3The causes of pain are four, the first is a sodain and violent invasion of some untemperate thing, by means of the four first qualities; the second is, solution of continuity, by a wound, luxation, fra∣cture, contusion, or distension; the third, is the exquisit sense of the part, for you feel no pain in cutting a bone, or exposing it to cold or heat; the fourth is, the attention, as it were, of the Ani∣mal faculty;* 1.4 for the mind, diverted from the actual cause of pain, is less troubled, or sensible of it.
A part is weak, either by its nature, or by some accident: by its nature, as the Glandules and the Emunctories of the principal parts; by accident, as if some distemper, bitter pain, or great de∣fluxion have seized upon it, and wearyed it, for so the strength is weakned, and the passages dila∣ted. And the lowness of site yields opportunity for the falling down of humors.
* 1.5The causes of congestion are two principally, as the weakness of the concoctive faculty, which resides in the part, (by which the assimilation into the substance of the part of the nourishment flowing to it, is frustrated) and the weakness of the expulsive faculty; for, whilst the part cannot expel superfluities, their quantity continually encreases.
And thus oftentimes cold Impostumes, have their original from a gross and tough humor, and so are more difficult to cure.
Lastly, all the causes of Impostumes may be reduced to three; that is, the primitive, or extern∣al: the antecedent, or internal; and the conjunct, or containing: as we will hereafter treat more at large.
After what manner tu∣mors against Nature are chiefly made.
The causes of heat.
Four causes of pain.
Two causes of weakness.
Two causes of congestion.