Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] FIG. 57. FIG. 58. _FiG. 57.—Diagram of circulatory system of a young dragon-fly; in middle is the chambered dorsal vessel, or heart, with single artery. Arrows indicate direction of blood-currents. (After Kolbe.) FIG. 58.—Diagram of ventral nerve-cord of locust, Dissosteira Carolina. (After Snodgrass.) is a knot underneath the esophagus and from it a pair of stout threads which run up and around the esophagus, one on each side, and into a larger knot lying on t
Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] FIG. 57. FIG. 58. _FiG. 57.—Diagram of circulatory system of a young dragon-fly; in middle is the chambered dorsal vessel, or heart, with single artery. Arrows indicate direction of blood-currents. (After Kolbe.) FIG. 58.—Diagram of ventral nerve-cord of locust, Dissosteira Carolina. (After Snodgrass.) is a knot underneath the esophagus and from it a pair of stout threads which run up and around the esophagus, one on each side, and into a larger knot lying on top of the esophagus. These knots and thread compose the main part of the central nervous system of the caterpillar, the threads being the nerve-
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