Popular Science, joulukuu 1878

Color-Blindness is, according to M. Favre, consulting physician of one of the great railways of France, a frequent result of the abuse of alcohol and tobacco. He would interdict to every railway-man holding a responsible position the use of tobacco or alcohol in any form, because they tend to impair not only the power of discriminating colors, but also that of estimating distances and of perceiving objects.

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