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Shields The Eyes From: Although it is possible to make a Filter which is effective against ilmost any gas, it is not possible to combine in me Filter protection against all toxics. The filtering agents in the canisters of gas masks issued :o civilians and soldiers during wartime are mially highly activated charcoal, which adsorbs wison gas; granules of permanganate and soda ime, which neutralize it; and a Filter pad, which strains finely divided particles from the air. De-iigned primarily as protection against asphyxiants, :he gas mask also shields the eyes from tear gases md, when used with other protective clothing, is effective defense against nerve gases which may inter the body through the skin and eyes as well is the lungs.
The eyes of a spider are usually near the front or anterior end of the head, but some are directly on top. They are single facets, hence are called simple eyes. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack eyes entirely. Regardless of the number, the eyes are always placed in a definite arrangement. Often some pairs are much larger than others.
A typical insect is characterized by three divisions to the body—the head, the thorax, and the abdomen. Attached to the thorax are six jointed legs, three on each side, and sometimes wings.
Eyes: The eyes, when present, are placed somewhere upon the head and are of two types: simple eyes, called ocelli, which are found in insect larvae and in many adults; and compound eyes, which are found in adult insects and in the immature stages of types which resemble the adult during growth.
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