. Elementary entomology . Fig. 32. Ideal longitudinal section of an insect, showing relative position of organs a, alimentary canal; //, heart; Jii, muscle bands ; «, nerve cord ; r, reproductive organs. (After Comstock) Just beneath the back is a small, transparent tube, the dorsal blood vessel, or heart. Along the median line, close to the ventral wall, is a series of small white knots, or ganglia, connected by a double 28

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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912