Magia Naturalis, oder Hauß-, Kunst- und Wunder-Buch

18. The properties of the small particles are: that they are moved in such and such a manner, or rest in such and such a manner; that they lie in such and such a way; are so shaped; and possess this or that magnitude.

19. From these arise the so-called qualities; such as heat, cold, moisture, and dryness: as well as whether a thing is thick or thin; dense or porous; soft or hard; fluid, watery, oily, viscous, volatile, constant, flexible, transparent, opaque, or otherwise constituted in such and such a manner: as also, that it tastes, smells, looks, sounds, etc., in such and such a way, or possesses this or that virtue in medicine.

20. Heat is when the invisible particles are moved strongly hither and thither and on all sides. Cold is when the invisible particles enter into rest.

21. Moisture is when something is full of visibly fluid parts. Dryness, when the pores of a thing are filled with nothing but air and subtle matter.

22. A thing is called thick when it has large and coarse parts; thin, when it has small and subtle ones.

23. Dense is that which has few pores; porous, that which has many wide pores.

24. Hard is that whose parts are firm:

Soft, whose parts do not particularly hang together.

25. Fluid, whose parts easily slide away from one another. Watery, whose parts are smooth and long, and in part easily flexible, crawling about amongst one another. Oily, whose parts are branched.

26. Viscous, that which has many branched, thick particles. Volatile, whose parts easily depart from one another. Fixed and constant, whose parts hold firmly together.

27. Flexible, whose parts remain together and yet change their shape. Brittle, whose parts hang together in only a few places and at small points, and easily depart from one another.

28. Opaque, when the pores and passages are stopped up or interrupted, so that the rays of light cannot pass through in a straight line. Transparent; when the globules of the second element can pass everywhere through the passages of a body in a straight line.

29. A thing tastes sharp which has hard, cutting, piercing, strongly moved parts. Gentle or mild, whose parts are blunt, easily flexible, and weakly moved.

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