. Lessons in nature study. Nature study. BROOK INSECTS 6i ,.o X water. These in- sects arc either young stone-flies (fig. 32) or young May-flies (fig. 33). The young stone- flies have two tiny --;:-",9 claws on their feet ^ (examine with a magnifier^ and are usually more flat- tened and broader- bodied than the young May-flies, whose feet end in a single small claw. Take some of these insects alive to the school room, where they can be kept in a glass jar of water for a day or two. Put one of them into a watch glass of water, and examine it with a magnifier. Is it a young stone-fly (two c
. Lessons in nature study. Nature study. BROOK INSECTS 6i ,.o X water. These in- sects arc either young stone-flies (fig. 32) or young May-flies (fig. 33). The young stone- flies have two tiny --;:-",9 claws on their feet ^ (examine with a magnifier^ and are usually more flat- tened and broader- bodied than the young May-flies, whose feet end in a single small claw. Take some of these insects alive to the school room, where they can be kept in a glass jar of water for a day or two. Put one of them into a watch glass of water, and examine it with a magnifier. Is it a young stone-fly (two claws on feet) or a young May-fly (one claw on feet?) Examine the delicate gills projecting from the sides of the body : the young stone-flies usually have three pairs of gills on the thorax (part of the insect from which the legs arise), which are tufts of short gill-hairs ; the young May-flies usually have gills all along the abdomen, which may be transparent thin plates, or composed of gill hairs. (For an account of the way in which water insects breathe, and of the tracheal gills, see the lesson, "How Insects ;) Note that the legs of the young stone-fly are flattened and thickly fringed with stout hairs. What for? So that the legs may serve for swimming as well as. 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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