The influence of the blue ray of the sunlight and of the blue color 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 A. J. Pleasonton and others, between the years 1861 and 1876.

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The influence of the blue ray of the sunlight and of the blue color 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 A. J. Pleasonton and others, between the years 1861 and 1876. Public Domain Mark. Source: Wellcome Collection.