Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 230 ZOOLOGY Just behind the mouth is a large crop into which empty the con^ tents of the saUvary glands. It is this fluid mixed with digested food that we call the ' grasshopper's molasses.' After the food is digested by the action of the saliva and other juices, it passes in a fluid state through the walls of the intestine where most of it becomes part of the blood. As blood it is passed on to tissues, such as muscle, to be used in
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 230 ZOOLOGY Just behind the mouth is a large crop into which empty the con^ tents of the saUvary glands. It is this fluid mixed with digested food that we call the ' grasshopper's molasses.' After the food is digested by the action of the saliva and other juices, it passes in a fluid state through the walls of the intestine where most of it becomes part of the blood. As blood it is passed on to tissues, such as muscle, to be used in repairing that which is used up during the flight of the insect. Some of the foods are doubtless at once oxidized to release energy for the active insect. Eyes. — A considerable part of the surface of the head of the grasshopper is taken up by the compound eyes. Compare them with your own in position. Examination with a lens shows the whole surface to be composed of tiny hexagonal spaces called facets. Each facet is be- lieved to be a single eye, with perhaps distinct vision from its neighbor. The grasshopper also has three simple eyes on the front of the head. Find them. Other Sense Organs.— The segmented feelers or antennoe have to do with the sense of touch and smell. The ear of the grasshopper is found under the wing on the first segment of the abdomen as before noted. Cov- T t d' \ f ^ring the body and on the appendages, are found hairs of part of the (sensory hairs) which appear to be sensitive to touch. compound eye of Nervous System. — The nerve chain, as in the cray- fe^ets^c! nerves', ^^h, is on the ventral side of the body. As in the crayfish, it passes around the gullet near the head to the dorsal side, where a collection of ganglia forms the brain. Nerves leave the central system as outgoing fibers which bear motor impulses. Other nerve fibers pass inward, and produce sensations. Make a careful drawing of the locust, showing as many of the above parts as you
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