. A manual of elementary zoology . Zoology. 270 MANUAL OF ELEMENTARY ZOOLOGY four pairs of legs but has not yet reached the adult form. During part of this stage the animal is quiescent. Demodex folliculorum is a minute, long-bodied mite which lives in the grease-secreting or " sebaceous " glands of the human face. It is generally harmless, but appears sometimes to set up skin disease and is accused of spreading the bacillus of leprosy. In dogs it is the cause of a kind of mange. Larva? and adults live in the glands and are transmitted by contagion. Sarcoptes scabei causes the "
. A manual of elementary zoology . Zoology. 270 MANUAL OF ELEMENTARY ZOOLOGY four pairs of legs but has not yet reached the adult form. During part of this stage the animal is quiescent. Demodex folliculorum is a minute, long-bodied mite which lives in the grease-secreting or " sebaceous " glands of the human face. It is generally harmless, but appears sometimes to set up skin disease and is accused of spreading the bacillus of leprosy. In dogs it is the cause of a kind of mange. Larva? and adults live in the glands and are transmitted by contagion. Sarcoptes scabei causes the " itch " in man, and -Ky^vmZr^t <****" *. /Unit Fig. 176.—The Sheep Tick (Ixodes ricinus). —After Nutlall. A, Ventral view of male ; B, dorsal view of the same. a;,related species gives rise to mange in dogs. The adult itch-parasite lives in burrows in the skin and there lays its eggs. The larvae pass to the surface of the skin, where they live, for the most part under the scabs which the burrowing has caused to form, till the last stage, when the female makes the burrow. The treatment consists in baths and rubbing with various ointments, which generally contain flowers of sulphur. Neither Demodex nor Sarcoptes possess tracheae or eyes. The ticks, of which Ixodes may be. 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 Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
