CHAP. XII. Of the causes of Diseases of the whole substance.
DIseases of the whole Body, * 1.1 or of Occult qualities which are in the similar parts, besides diseases of intemperature, are all produced from causes of the whole substance, or acting in a hidden manner; such are all venomous, malignant things, and such as act in a hidden manner: Of such causes some are produced in the Body, some happen to it from without.
Those which are in the body are humours and excrements, * 1.2 if they contein in them malignant and venomous qualities; as pu∣trified Blood, Seed, and other corrupt humours.
As for external causes, * 1.3 First venomous and malignant Aire. Secondly, Virulent and contagious Diseases. Thirdly, Poyson drunk, or after what manner soever taken into the Body. Fourthly, Poysons which come by the smitings, or bitings of venomous creatures, or some other way communicated to the body externally.
Venom is either generated in the Air, or else the Air receives it from some other thing; * 1.4 It receives it from some other thing by malignant exhalations and vapours, from Cattel, Marish grounds, dead Carkasses, and other such like exhalations. Poyson is