. Lessons in nature study. Nature study. 14 NATURE STUDY. wrigglers were found is the best for the purpose. No special feeding is necessary; the organic matter in the stagnant water suffices. Do not put too many wrigglers into too small a jar of water. The mouth of the jar containing pupae should be covered with cheese- cloth, so as to prevent the escape of the winged mosquitoes which will emerge from the pupse. With half a dozen jars of material, the life history and habits of the mosquito can be admirably ob- served. All of the changes of the mosquito from egg to adult are completed in three
. Lessons in nature study. Nature study. 14 NATURE STUDY. wrigglers were found is the best for the purpose. No special feeding is necessary; the organic matter in the stagnant water suffices. Do not put too many wrigglers into too small a jar of water. The mouth of the jar containing pupae should be covered with cheese- cloth, so as to prevent the escape of the winged mosquitoes which will emerge from the pupse. With half a dozen jars of material, the life history and habits of the mosquito can be admirably ob- served. All of the changes of the mosquito from egg to adult are completed in three or four weeks. Observing and Questioning-. What is the wrig- gling of the wrigglers? Evidently simply the peculiar mode of swimming or moving thru the water. It is a violent lashing of the tail end of the body. The wrigglers move in any direction at will by means of this lashing. If a IflG.:*. The Pupa, b t, breathing tube; sf, swimming flaps Wriggler whlch IS at the tip of the body. swimming thru the water stops "wriggling" i. e. stops swimming, what happens? It slowly sinks. (If it touches the walls of the jar it may not sink because of the friction.) Why does it sink ? And why so slowly? It is evidently heavier (denser) than water, but only slightly so. There are, however, always many wrigglers hanging head downward just beneath the surface of the water; hanging down in fact from the surtace of the water. What are they doing ? 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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