. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 42 /INIM/IL ACTIVITIES. hairs which seem to increase their sensibility, and they are connected with the nerve-centres within the body, as are the other organs of sense. Movements. In addition to the motion called forth by irritation of the sense-organs, the grasshopper is evidently able to move on his own account. He can walk, fly, or jump where and when he wishes. The. Fig. 45 The Stridulating Organ of a Cricket. u, large vein; l>, roughened cross-vein; c, membrane. adaptation of the legs to the mode of life needs no
. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 42 /INIM/IL ACTIVITIES. hairs which seem to increase their sensibility, and they are connected with the nerve-centres within the body, as are the other organs of sense. Movements. In addition to the motion called forth by irritation of the sense-organs, the grasshopper is evidently able to move on his own account. He can walk, fly, or jump where and when he wishes. The. Fig. 45 The Stridulating Organ of a Cricket. u, large vein; l>, roughened cross-vein; c, membrane. adaptation of the legs to the mode of life needs no comment. The structure of the wings, however, may be briefly considered. The wings are outgrowths of the hard exoskeleton. They are composed of a frame- work of double tubes over which is stretched a mem- brane. The inner tube of one of the veins carries air. The outer tube surrounding this is filled with blood. Thus the wing becomes an organ of respiration as well as an organ of flight. Lightness and strength are also obtained at the same time. Comparison of Grasshopper and Cricket. Crickets are easily collected. They may be studied in the same way as the grasshopper. In writing notes concerning the cricket, make use of the new descriptive words learned while studying the grasshopper. Write in your note-book only such facts as can be made out from the specimens. At the top of the page in your note-book ^rite "Grasshopper and Cricket". Draw a vertical. 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 French, Nathaniel Stowers, 1854-. New York [etc. etc. ] Longmans, Green and Co
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