ABSTRACT
There are two kinds of accidents. The one is of such a nature that, in order to conceive of it, it is not necessary for someone to regard anything other than its substance. In conceiving of the second kind, however, one has no choice but to regard something other than its substance. The first is divided into two subdivisions. One of these subdivisions is of such a nature that due to it a substance becomes receptive to measurement, divisibility, and the ability to diminish and to increase. The subdivision having this capability is called ‘quantity’, chandī (in Persian) and kammiyya (in Arabic). The second subdivision is of a different nature. It is a condition of a substance for which it is not necessary to regard a thing external to it in conceiving of it. Substance is not divisible because of accident. This second subdivision is called ‘quality’, in Persian chigūnagī and in Arabic kaifïya. Examples of quantity are number, longitude, width, depth, and time. Examples of quality are health, sickness, piety (pārsā’ī), sagacity (bakhradi), knowledge (dānish ), strength, weakness, wiiiteness, blackness, olfaction, taste, sound, warmth, coolness, wetness, dryness, and whatever is analogous to this group, as well as roundness, straightness, triangularity, squareness, softness, roughness, and whatever is analogous to them.
