. Boys and girls in biology : or, Simple studies of the lower forms of life. Biology. THE BUTTERFLY. 165 twisted or spiral thread, which runs all through them like the spiral thread which keeps the air-vessels of the bean-stalk open, thus protecting the life of the vine. Indeed, they look very much like the spiral vessels of plants (Fig. 138). This machinery for breathing, or Fig. 138. Air-Tube, with one of its Branches. respiration, is entirely different from that of the mus- sel or lobster. There is no special place in the body where all the blood comes to get air. " Instead of the bloo
. Boys and girls in biology : or, Simple studies of the lower forms of life. Biology. THE BUTTERFLY. 165 twisted or spiral thread, which runs all through them like the spiral thread which keeps the air-vessels of the bean-stalk open, thus protecting the life of the vine. Indeed, they look very much like the spiral vessels of plants (Fig. 138). This machinery for breathing, or Fig. 138. Air-Tube, with one of its Branches. respiration, is entirely different from that of the mus- sel or lobster. There is no special place in the body where all the blood comes to get air. " Instead of the blood coming to the air, the air goes to the blood" through the little tubes that we find spreading them- selves through the whole body (Fig. 138). The tubes are called trachea, or wind-pipes—trachus means rough, and these rings make the air-tubes quite rough. When the air is to be expelled, the creature brings the walls of his body together and forces the air out. The circulation of the caterpillar's blood is brought. 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 Stevenson, Sarah Hackett, 1843-1909; Huxley, Thomas Henry, 1825-1895. New York : D. Appleton and company
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Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbiology, bookyear1875
