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HAving the opportunity of a convenient place, and a fair Day, I set the Vial about Noon in a window, opened towards the South, and left it there expos'd to the Sun-beams for a considerable time, to try, whether they would, upon the account of their agitation, or some imaginable affinity of nature, kindle or excite the luciferous liquor, or its effluvia. But I
could not perceive that the Sun-beams had such an operation, which I chiefly concluded from my not being able to perceive any whitish or mist-like fumes in the Cavity of the Glass, for I durst not rely upon my not perceiving any light, in the darkest corner of the Room, because I suspected, that might proceed from my eyes having been accustomed to the great light of the then fair day, which made it less sus∣ceptible of impressions from a faint light.