. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 166 CIVIC BIOLOGY relief, if applied soon after exposure and before the mites have become embedded in the skin. Itch mites — Sarcoptes scabiei {scabere, *^ to scratch'»). These mites have long been a terror to man. They multiply at the rate of 15,000,000 from a single pair during the season, are easily passed from one animal to another, and are extremely difficult to control. There are many varieties of itch mites, differing in size ac- cordmg to the thick- ness of skin of the anim
. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 166 CIVIC BIOLOGY relief, if applied soon after exposure and before the mites have become embedded in the skin. Itch mites — Sarcoptes scabiei {scabere, *^ to scratch'»). These mites have long been a terror to man. They multiply at the rate of 15,000,000 from a single pair during the season, are easily passed from one animal to another, and are extremely difficult to control. There are many varieties of itch mites, differing in size ac- cordmg to the thick- ness of skin of the animal they attack. The pig, horse, wolf, goat, camel, sheep, doo; — each has its own variety (de- creasing in size in the order here given) and the human mite is the smallest of all. The punctures made in the skin bv mites are soon covered with a crust, the eggs bemo- found beneath it. The human mite is best held in check by warm baths with free use of soap followed by an application of sulphur ointment. The same treatment is equally good for dogs. Sheep-scab mite. —Psoroptes communis (var. ovis). This para- site is distributed over the entire world and has proved so destructive that most countries have passed laws to prevent its importation or spread. With intelligent cooperation in the use of precautions and methods of treatment now understood, sheep scab could soon be Fig. 81. Egg cocoons of spiders on burdock Photograph by Dr. J. P. Porter. 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 Hodge, Clifton Fremont, 1859-; Dawson, Jean, 1873-. Boston, Ginn
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