. Elementary entomology . Fig. 46. Illustrating mode of vision in compound eye " The light enters through the cornea. The rays which strike the sides of each tube or cone are absorbed by the black pigment which surrounds the tube. Ac- cordingly those rays of light only which pass through the crystalline cones directly (or are reflected from their sides), such as a-a', b-b', c-c', d-d', e-e', will ever affect the nerves at a', b', </, d', e'." (After Lubbock, from S. J. Hunter)

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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912