It is on this principle, too, that the small concentrated residues of great operations in the arts are almost sure to be the lurking places of new chemical ingredients: witness iodine, brome, selenium, and the new metals accompanying platina in the experiments of Wollaston and Tennant.
"A System Of Logic, Ratiocinative And Inductive (Vol. 1 of 2)"
John Stuart Mill
Its action is based on the peculiar property of selenium, which, you probably know, changes its electrical conductivity under the influence of light.
"Guy Garrick"
Arthur B. Reeve
selenium in the dark is a poor conductor of electricity; in the light it, strange to say, becomes a good conductor.
"Guy Garrick"
Arthur B. Reeve