The Right Honourable Sir Henry Enfield Roscoe P.C., D.C.L., F.R.S. A Biographical Sketch
Part IV. Comparative and absolute measurement of the chemical
rays. Chemical action of diffuse daylight. Chemical action of direct sunlight. Photochemical action of the sun compared with that of a terrestrial source of light. Chemical action of the constituent parts of solar light. (_Phil. Trans._ (1859), pp. 879-926.)