. The honey-bee; its nature, homes and products. Bees. PHYSIOLOGY OF THE BEE. 85 be easily seen in flies, bluebottles, moths, butterflies, &c. The numbers of the facets vary greatly in different families of the Articulata. In the common house-fly there are, it is stated, about 4,000; in the white cabbage-butterfly, 17,000; in the dragon-fly, 24,000. It has been computed that in each com- pound eye of the bee there are about 3,500 of Fig. 25.—Eyes of a BeEj greatly magnified. s^. Behind the horny covering, or cornea, which con- sists of two plano-convex lenses, is a layer of dark pig
. The honey-bee; its nature, homes and products. Bees. PHYSIOLOGY OF THE BEE. 85 be easily seen in flies, bluebottles, moths, butterflies, &c. The numbers of the facets vary greatly in different families of the Articulata. In the common house-fly there are, it is stated, about 4,000; in the white cabbage-butterfly, 17,000; in the dragon-fly, 24,000. It has been computed that in each com- pound eye of the bee there are about 3,500 of Fig. 25.—Eyes of a BeEj greatly magnified. s^. Behind the horny covering, or cornea, which con- sists of two plano-convex lenses, is a layer of dark pigment, which gives the characteristic colour to these eyes. This is pointed like the neck of a vase, and serves the purpose of the iris in the higher animals. This is traversed by a minute aperture or pupil, through which the rays pass by a longer conical lens to the optic nerve. A vertical section shows that each ocellus (or little eye) is the frustum of a pyramid, the large end or base of which is bounded by the cornea, while the other and pointed end. 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 Harris, William Hetherington, 1835-. London, The Religious tract society
Size: 1705px × 1465px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1880, booksubjectbees, bookyear1884
