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1 3|   extreme must be something real; and that colour is just
2 3| limit of the body; is not a real thing; rather we must suppose
3 3|     infra], might pass as a real theory of colour-mixture.
4 3|     plain] that this is the real cause determining the existence
5 6| cognize these [hypothetical real things without sensible
6 6|  are magnitudes, physically real, but without sensible quality],
7 7| only appear to do so, their real successiveness being unnoticed