Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] INSECTS 241 objects the keenness of vision and especially the distance at which a flj notices movement of an object. Feed the fly with a drop of sugar solution. Study the movement of the organ called the proboscis. This proboscis is made up chiefly of the maxillsE, together with the labial palps, the mandible being undeveloped. P'ood is obtained by lapping and sucking. Notice the flaplike extensions on each side of the proboscis; th
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] INSECTS 241 objects the keenness of vision and especially the distance at which a flj notices movement of an object. Feed the fly with a drop of sugar solution. Study the movement of the organ called the proboscis. This proboscis is made up chiefly of the maxillsE, together with the labial palps, the mandible being undeveloped. P'ood is obtained by lapping and sucking. Notice the flaplike extensions on each side of the proboscis; these are roughened on the under surface. It is the rubbing of this filelike organ over the surface of the skin that causes the painful bite of the horse fly. If possible, examine the foot of a fly under a low magnification of the compound microscope. The foot shows a won- derful adaptation for clinging to smooth surfaces. Two or three pads, each of which bears tubelike hairs that secrete a sticky fluid, are found on its under surface. It is by this means that the fly is able to walk upside down. Home Experiments.—Test the keenness of scent in the fly by placing in an exposed place a bit of meat, some bread, salt, sugar, and other foods, some of which have distinct odor. Cover each food with tissue paper. Which food attracts the most flies ? Test the sense of taste of the fly by the following experiment. Place in a netting cage four butter chips containing a solution of sugar, salt, alum, and strychnine or other bitter fluid. Place in the cage a number of flies, and at the end of a given period count the number at each dish. Do flies appear to have the sense of taste ? Life history of house flies, showing from left to right the eggs, larvao, pupae, and adult flies. Photograph, about natural size, by Overton. The House Fly a Pest. — The house fly is recognized the world over as a pest. Not only do flies spoil much food by means of their filthy habits, but the far more impor
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