The Philosophical magazine; a journal of theoretical, experimental and applied physics . •170 Centre of blue ... •100 002700 Line G Line H 0 0 0310056 12 Dr. Gardner on the Action of Yelloiio 37. Upon projecting these numbers, which, although notrigorously correct, are very good approximations, the unity ofthe active agent will be more strikingly exhibited. Let theaxis of abscissas be divided into intervals corresponding toFraunhofers coloured spaces, and the positions of the meanplaces of the dark lines be marked from Mr. Powells recentwork on dispersion. The ordinates are from the jireceding
The Philosophical magazine; a journal of theoretical, experimental and applied physics . •170 Centre of blue ... •100 002700 Line G Line H 0 0 0310056 12 Dr. Gardner on the Action of Yelloiio 37. Upon projecting these numbers, which, although notrigorously correct, are very good approximations, the unity ofthe active agent will be more strikingly exhibited. Let theaxis of abscissas be divided into intervals corresponding toFraunhofers coloured spaces, and the positions of the meanplaces of the dark lines be marked from Mr. Powells recentwork on dispersion. The ordinates are from the jirecedingtable; Fraunhofers estimates are indicated by a bold Drapers by ilots, and my own by an interrupted Had more points in these figures been determined, there isno doubt they would have coincided precisely. It is not tobe forgotten that these results were obtained in places manyhundred miles apart. They determine, what hitherto has onlybeen conjectured, that the greening of plants and decomposi-tion of carbonic acid are produced by the same agent, whichis also the active imponderable in producing vision, a phccno-menon in no way similar, as suggested by jNI. INIoser, to thechange of Daguerres plate, which is a tithonic action. The dependence of the depth of green colour in foliageupon brilliant light is also shown. The statements of tra-vellers, in regard to tropical vegetation, confirms this conclu-sion. 38. Chlorophyl, the body generated in the yellow leafletsof plants, raised in darkness by the action of light, is a hydro-carbon of the nature of wax. Whether it be produced by and of Indigo Light on Plants. 13 decomposition of carbonic acid, or be tlie deoxidized yellowmatter, or soms03philosophicalmag24londuoft
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