. Nature-study; a manual for teachers and students. Nature study. 25° NATURE-STUDY. the silk threads issue. This consists of a number of little projections covered with minute, tubular hairs, through which the threads come. The silk is at first liquid, but quickly hardens in the air. The different strands are pressed and twisted together into a strong thread. The spider uses its hind feet in arranging, guiding, and fastening its silk. Shake a spider from its web. Notice that it is still attached to the web by a fine thread upon which it again climbs back. Spiders are useful crea- tures and des
. Nature-study; a manual for teachers and students. Nature study. 25° NATURE-STUDY. the silk threads issue. This consists of a number of little projections covered with minute, tubular hairs, through which the threads come. The silk is at first liquid, but quickly hardens in the air. The different strands are pressed and twisted together into a strong thread. The spider uses its hind feet in arranging, guiding, and fastening its silk. Shake a spider from its web. Notice that it is still attached to the web by a fine thread upon which it again climbs back. Spiders are useful crea- tures and destroy many insects. Out of doors they ought to be protected rather than killed. Try to counteract the prevailing prejudice against them. Related to spiders are the Daddy-long-legs, or Harvestmen, which also are useful in destroying mosquitoes and other insects. Centipedes and Millipedes possess the segmental character of the body, the jointed legs, and the biting mouth-parts of insects, yet are very different. They are found under boards, logs, and stones. Centipedes are flat, worm-like animals, with a pair of legs to each joint of the body. They are carniv- orous, living on other insects, worms, etc., which they catch. The first pair of feet are modified into poison fangs. In tropical countries there are large centipedes whose bite is dangerous to man. Similar to the last is the millipede, or Fig. 04. 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 Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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