. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. 152 INSECT Fig. 123.—Net of a net-building caddice-wonn. in this rude retreat is a fisherman, and stretched be- tween two stones near-by can be seen his net. This is made of silk. It is usually funnel-shaped, opening up-stream, and in the center of it there is a portion composed of threads of silk extending in two directions at right angles to each other, so as to form meshes of surprising regu- larity. It is as if a spider had stretched
. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. 152 INSECT Fig. 123.—Net of a net-building caddice-wonn. in this rude retreat is a fisherman, and stretched be- tween two stones near-by can be seen his net. This is made of silk. It is usually funnel-shaped, opening up-stream, and in the center of it there is a portion composed of threads of silk extending in two directions at right angles to each other, so as to form meshes of surprising regu- larity. It is as if a spider had stretched a small web in the water where the cur- rent is swiftest (Fig. 123). These nets occur in rap- ids between stones, but in many places they are to be found in greater numbers along the brinks of falls. Here they are built upon the surface of the rock, in the form of semi-elliptical cups, which are kept distended by the current. Much of the coating of dirt with which these rocks are clothed in summer is due to its being caught in these nets. It is usually difficult to procure specimens of these nets for preservation; sometimes, however, one can be found attached to the surface of a single small stone or to a piece of wood in such a way that it can be removed from the water without injury to it. Find some net-building caddice-worms and learn all you can regarding their ways; collect specimens for your collection and for study; compare their structure with that of other caddice-worms ; pre- serve specimens of larvae in alcohol; and dry, if pos- sible, some of their nests and nets. Write an account of these 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 Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. New York, D. Appleton and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomol, bookyear1901
