. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 78 ANIM/IL JCTiyiTIES. Breathing of a Dragon-fly Nymph. An insect living in the water must breathe, and it is interesting to observe how insects which have chosen an aquatic life have adapted their breathing-organs to the medium in which they live. The dragon-fly larva does not trouble himself to come to the surface for air, but simply takes his oxygen from the air dissolved in the water. The spiracles which would allow water as well as air to enter the breathing-tubes are closed and covered by the hard exo-skeleton, but
. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 78 ANIM/IL JCTiyiTIES. Breathing of a Dragon-fly Nymph. An insect living in the water must breathe, and it is interesting to observe how insects which have chosen an aquatic life have adapted their breathing-organs to the medium in which they live. The dragon-fly larva does not trouble himself to come to the surface for air, but simply takes his oxygen from the air dissolved in the water. The spiracles which would allow water as well as air to enter the breathing-tubes are closed and covered by the hard exo-skeleton, but the tracheae or breath-. Fig. 69.—The Imago of a Dragon-fly. ing-tubes, like those in the grasshopper, convey the air throughout the body. To get the air, the water is drawn in through the anal opening, where it comes in contact with some modified air-passages which have somewhat the function of gills. In these air-passages the carbon dioxide and other impurities await the opportunity to pass by osmosis to the water, while the oxygen penetrates through the membranes into the breathing-tubes. If a fine stream of bright-colored liquid be put near a nymph by means of a small pipette the currents produced by the breathing may be 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 French, Nathaniel Stowers, 1854-. New York [etc. etc. ] Longmans, Green and Co
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecta, booksubjectzoology
