Identifier: lightenergyitsph00clea (find matches)
Title: Light energy, its physics, physiological action and therapeutic applications
Year: 1904 (1900s)
Authors: Cleaves, Margaret Abigail, 1848-1917
Subjects: Medicine, Physical Phototherapy Light Radioactivity
Publisher: New York, Rebman company (etc., etc.)
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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-?«nJ -240 PHOTOMETRIC CURVES.FOR EQUAL TOTAL AMOUNTS OF LIGHT A—Sun-light.B— Fire-fly light. Abscissae—Wave Lengths.Ordinates—Luminous Intensities.
Text Appearing After Image:
B. Fire-fly Spectmint. Fig- 3- THE PHYSICS Of LIGHT ENERGY. 12<j agent only, illustrating at the same time the luminous effi-ciency of the firefly spectrum. But as these pages endeavorto show, the sun shines not simply for the purpose of illumi-nating the darkness, but that life from the elementary formsto the higher organisms may exist. CHAPTER III. The Action of Light Energy upon Elementary Forms of Life. The irritability of a mass of protoplasm of a protozoan ofthe simplest kind is established in a certain manner underthe influence of light energy. This has been extensivelystudied. Action of Luminous Rays upon a Plastide.—If a beamof parallel luminous rays of feeble intensity fall upon aplastide in water, the reactions between the plastide and thesurrounding medium are favored by the energy deliveredin this way. This was studied by Dantic.1 Chemical re-actions are established which are much more active on thesurface upon which the light falls than on the opposite face,but feeb

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