. Lessons in nature study. Nature study. BROOK INSECTS 63 and October (near Stanford University) and winged adults of which were issuing constantly thru those months. The young May-flies live for many months, some species for one or two or even three years, in the water. The life of the adult is, on the con- trary, at longest, not more than a few days, and some kinds live in the winged condition for but a few hours. The stone-flies do not spend so much time in the water, nor die so soon after acquiring wings. Caddice-worms — Firmly attached to stones, especially large ones, in swift parts o± t
. Lessons in nature study. Nature study. BROOK INSECTS 63 and October (near Stanford University) and winged adults of which were issuing constantly thru those months. The young May-flies live for many months, some species for one or two or even three years, in the water. The life of the adult is, on the con- trary, at longest, not more than a few days, and some kinds live in the winged condition for but a few hours. The stone-flies do not spend so much time in the water, nor die so soon after acquiring wings. Caddice-worms — Firmly attached to stones, especially large ones, in swift parts o± the stream, may be found small cases (fig. 36 b) or houses composed of many small pebbles fastened together with silk. In more quiet places in the stream may be found either attached to stones or resting on the bottom, or sometimes floating in the water, elongate cases (Fig. 37), an inch to two inches long, made of bits of wood fastened together with silk or bits of pine needles or even grass stems tied cleverly together by silken threads. Or tiny cornu- copias (fig. 36 a) composed of sand grains, may be found. All these are the cases of the caddice-worms or case-woims, and the caddice worm itself may be found snugly concealed in its case. Find and collect as many dififerent kinds of caddice-worms cases as you. Fig, C5, A May-liy. Caddice-fly cases made of sandta), and pebbles (d).. 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 Jenkins, Oliver Peebles; Kellogg, Vernon L. (Vernon Lyman), 1867-1937. joint author. San Francisco, The Whitaker & Ray Company
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