he eyes of animals possess various devices for the GRAPHY WITH THE LENS OF A BEETLE'S EYE. refraction of light and the formation of images upon the retina. The crystalline lens and the cornea appear water. Then came the important work of covering to be the most important of these devices. When the… … 95 feet in width, and 50 feet in depth through the Clay. Then through the center of this trench another Fig. 4—PHOTOGRAPH OF A WASP MADE WITH THE Fig. 3.—PHOTOGRAPH OF A FLEA MADE WITH THE excavation was dredged out which was 50 feet in width CRYSTALLINE LENS OF A BULLOCK'S EYE. USUAL LENS. and…
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