Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 118
of an extraneous source of energyderived from chemical oxidations intbe living cells of the sense organs. There is one more fact to be noted.The suns rays differ physically in wavelength only, yet we perceive those oflong wave length by the skin and asheat, not light ; those of rather shorterlength… … Fig. 1.—Retina of the Eye (Dig), as seen under the microscope. (Ramon Y Cajal). with that passing along the auditory as only to be affected by the rays ofnerve when a sound is heard. And, just longer wave length, while the retina isas we use different kinds of mechanism only affected by rays of…
Lighting
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