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able absorbed animals appear aura emitted aura's auric blue-grey bluer bright cause CHAPTER ciliary muscles clearly complementary colour cones contain cornea course dark dicyanin disease distal margin dorsal bulge Dwarf ectoderm effect electric field electrically charged emission emit an aura endoderm extend eyes fact fingers fluorescence focus fovea centralis gaze glands glass green haze emitted inches insects inside aura length lens lenses less living body look magnet mesoderm muscles naturally neighbourhood nerve neurones normal object obvious origin outer haze particles perhaps phantom images phosphorescence pigment possibly pregnancy present presumably primary colours probably produced purple quartz re-emitted refractive refractive index result retina rods screen seems seen sensitive shade shorter wave-length side skin slightly stimulation substance suggestion surface surrounding texture tion tissue ultra ultra-violet rays violet rays visible light visible spectrum vitreous humour waves white light Wimshurst machine yellow