This passage in Aristotle's treatise On Dreams was for a considerable time regarded as too indelicate for the English reader, and thus languished in the decent obscurity of a dead language: both Beare in the Oxford translation and Hett in the original Loeb edition preferred a Latin version. It may be for this reason that somewhat scant attention has been paid to Aristotle's disquisition on menstruating women and their effect upon mirrors. I In offering some comments on the passage, I bypass the question of Aristotle's credulity and focus on a different question: what interested Aristotle in the supposed fact that the gaze of a menstruating woman has the power to redden the mirror into which she looks? The passage occurs in the context of Aristotle's explanation of the phenomenon of dreams, an explanation that relies chiefly on the notion of residual sense impressions. Although sense perception as normally understood is not operative in dreams 458b8, it is not true that the sense organ is unaffected 459a6, 10. Dreams belong, he says, to the sensitive faculty, but qua imaginative 459a21. The images involved in the sense organs not only while the sensations are active but also after they have gone 459a27-28.2 After enunciating this general principle, Aristotle proceeds to illustration. He begins with the case of projectiles: they continue to move even after they have broken contact with the moving agent 459a28-30. This illustration from the category of place is by way of introduction to illustrations from the category of quality, qualitative change or change of state being the type of change most relevant to sensation. Again he emphasizes the factor of persistence, adding that change of state may persist deep down (bathu 459b7) as well as on the surface. Examples are drawn from smell and hearing 459b21, but mainly from vision. The act of looking at a green object for a considerable time may, for instance, produce such a strong effect upon the eye that any object to which we shift our gaze appears to be that colour 459b12-14.3
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