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Scientific American, Vol. 67, No. 9 (1892) (1892)
leaf 7
his invention. The experiment was surrounded, for, though they are not all strictly water method consists in first taking a red, a yellow, and a to be made at the Villette gas works, and let us say | plants, they all need considerable water to enable them blue negative of the object on plates… … L. Gregory, Popular tive intensities of the par- Science Monthly, allel rays falling into it. © 1892 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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