. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. The "nerves" of an Insect's wing con- sist of a tube within a tube: the inner one is a trachea carrying air, and the outer one, ^ , , sheathing it, is a blood-vessel. So perfect Fig. 80. —Tracheal , ^ \ '• Tube of au Insect, is the aeration of the whole body, from highly magDifled, . „ i i i i • • i showing elastic bram to lect, the blood is oxygenized at spiral thread. ^j^^ moment when, and on the spot where, it is carbonized; only one kind of fluid is, therefore, cir- culating— arterial. It
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. The "nerves" of an Insect's wing con- sist of a tube within a tube: the inner one is a trachea carrying air, and the outer one, ^ , , sheathing it, is a blood-vessel. So perfect Fig. 80. —Tracheal , ^ \ '• Tube of au Insect, is the aeration of the whole body, from highly magDifled, . „ i i i i • • i showing elastic bram to lect, the blood is oxygenized at spiral thread. ^j^^ moment when, and on the spot where, it is carbonized; only one kind of fluid is, therefore, cir- culating— arterial. It is difficult to drown an Insect, as the water can not enter the pores; but if a drop of oil be applied to the abdomen, it falls dead at once, being suf-. FiG. 81.—Ideal Section of a Bee: o, alinienlary canal; ?i, dorsal ves-el; f, trachea ; n, nervous cord. focated. Tlie largest spiracle is usually found on the thorax, as under the wing of a Moth: such may be stran- gled by pinching the thorax. In Millipedes and Ceiitii)edes, the spiracles open into. 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 Orton, James, 1830-1877. New York, Harper and brothers
Size: 1923px × 1300px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
