Note 81:1 — Chapter II
Reading edition
One cannot escape a feeling of astonishment on finding so great a philosopher as Reid saying, (Active Powers, ch. ix.) that on this theory day and night might be called mutually the cause and effect of each other, on account of their mutual sequence: as if the observation of those who have gone so far in civilisation as just to have seen ignited bodies, had not data for concluding that that phenomenon which most uniformly preceded the ramification of rays of light, was the appearance of a luminous body.