comprehended, for it is the mixture that we perceive, and for this reason those who have the jaundice see everything yellow, and those with bloodshot eyes bloody.  Since the same sound appears different in broad open places from what it does in narrow and winding ones, and different in pure air and in impure, it is probable that we do not perceive the tones unmixed; for the ears have narrow winding passages filled with vaporous secretions, which it is said gather from places around the head.  Since also there are substances present in the 127 nostrils and in the seat of the sense of taste, we perceive the things smelled and the things tasted in connection with them, and not unmixed.  So that because of mixture the senses do not perceive accurately what the external objects are.  The intellect 128 even does not do this, chiefly because its guides, the senses, make mistakes, and perhaps it itself adds a certain special mixture to those messages communicated by the senses; for in each place where the Dogmatics think that the ruling faculty is situated, we see that certain humors are present, whether one would locate it in the region of the brain, in the region of the heart, or somewhere else.  Since therefore according to this Trope also, we see that we cannot say anything regarding the nature of external objects, we are obliged to suspend our judgment.

THE SEVENTH TROPE.

The seventh Trope is the one which, as we said, is based 129 upon the quantity and constitution of objects, constitution commonly meaning composition.  And it is evident that we are obliged to suspend our judgment according to this Trope also in regard to the nature of things.  As for example, filings from the horn of the goat appear white when they are seen separately and without being put together; put together, however, in the form of a horn, they look black.  And the parts of silver, the filings that is, by themselves appear black, but as a whole appear white; and parts of the Taenarus stone look white when ground, but in the whole stone appear yellow; grains of sand 130 scattered apart from each other appear to be rough, but put together in a heap, they produce a soft feeling; hellebore taken fine and downy, causes choking, but it no longer does so when taken coarse; wine also taken moderately strengthens us, but 131 when taken in excess relaxes the body; food similarly, has a different effect according to the quantity, at least, it often disturbs the body when too much is taken, causing dyspepsia and discharge.  We shall be able here also to say of what kind 132 the cutting from the horn is, and what many cuttings put together are, of what kind a filing of silver is, and what many of them put together are, of what kind the tiny Taenarus stone, and what one composed of many small ones is, and in regard to the grains of sand, and the hellebore, and the wine, and