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.

Licence: Public Domain Mark

Credit: 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. Source: Wellcome Collection.