Text: "That the different colors of the spectrum have an influence on vegetation has long been known. Plants grown under green glass soon die; under red glass they live a long time, but become pale and slender. Mr.Yung, of the University of Geneva, has placed the eggs of frogs and fishes in similar conditions, and found that violet light quickens their development; and blue, yellow, and light also, but in a lesser degree. Tadpoles, on the contrary, die sooner in colored light than in white light. As regards frogs, Mr. Yung has ascertained that their development is not stopped by darkness, as some observers have supposed, but that the process is much slower than in the light." Eclectic Magazine, 1880, pp 510

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