. The bee-keeper's guide : or Manual of the apiary . Bee culture; Bees. 6o Histology of Eyes. branes. This serves like the bl;icli lining of our own eye, and of optical instruments, to limit the rays of light. At the base of the rods is spread the nervous termination of the great optic nerves (Fig. 17), which extend from the brain, and which before reaching the eye passes through a gan- glionic enlargement. Whether the true retina exist in the Fig. Rods much magnified, Retiim^a Eye. columns between the rods, or at the base of the columns, is a disputed question. The old idea of Miiller,
. The bee-keeper's guide : or Manual of the apiary . Bee culture; Bees. 6o Histology of Eyes. branes. This serves like the bl;icli lining of our own eye, and of optical instruments, to limit the rays of light. At the base of the rods is spread the nervous termination of the great optic nerves (Fig. 17), which extend from the brain, and which before reaching the eye passes through a gan- glionic enlargement. Whether the true retina exist in the Fig. Rods much magnified, Retiim^a Eye. columns between the rods, or at the base of the columns, is a disputed question. The old idea of Miiller, that the image of each eye is a distinct portion of a large compound whole—a mosaic—is now abandoned. The philosophy of sight in insects is rather like that of higher animals, except thousands of eyes instead of two are used as one. Delicate trachcce pass into the eyes between the rods. The color of eyes varies verv much, owing to pigment. In some of the bees, wasps, and Diptera or two-winged flies, the coloration is exceedingly beautiful. Often the irides- cence, or play of colors, as the angle of vision changes, is wonderfully rich. The form, size and position of eyes vary much, as seen by noticing the eyes of drones and v\'orkers. Sometimes as in bees (Fig. 12), the eyes are hairy, the hairs arising from between the facets. Usually the eyes are naked. The number of facets, or simple eyes which form the compound eye, is often prodigious. There may be 17,00c in a single compound Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cook, Albert John, 1842-1916. Chicago, Ill. : George W. York & Co.
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectbees, bookyear1894
