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The influence of different colors of the ray of the sunlight

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The influence of the blue ray of the sunlight and of the blue colour of the sky, in developing animal and vegetable life; in arresting disease, and in restoring health in acute and chronic disorders to human and domestic animals, as illustrated by the experiments of Gen. A.J. Pleasonton, and others, between the years 1861 and 1876. https://archive.org/details/influencebluera00pleagoog

And next. CHAPTER SEVENTH.—CHROMO CULTURE OF VEGETABLE LIFE. . https://ia801503.us.archive.org/35/items/PrinciplesOfLightAndColor/ThePrinciplesOfLightAndColorByEdwinDBabbitt1878.pdf