Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . sconsists of a tense membrane, the tympanum, surroundedby a horny ring (Fig. 22). On the internal surface of thismembrane are two horny processes (o, u), to which is attached * Forel, however (Recueil Zoologique Suisse, 1887), denies thatthese tympanic organs are necessarily ears, and thinks that all insectsare deaf, with no special organs of hearing, but that sounds are heardby their tactile organs, just as deaf-mutes perceive at a distance therumbling of a carriage. But he appears to overlook the fa
Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . sconsists of a tense membrane, the tympanum, surroundedby a horny ring (Fig. 22). On the internal surface of thismembrane are two horny processes (o, u), to which is attached * Forel, however (Recueil Zoologique Suisse, 1887), denies thatthese tympanic organs are necessarily ears, and thinks that all insectsare deaf, with no special organs of hearing, but that sounds are heardby their tactile organs, just as deaf-mutes perceive at a distance therumbling of a carriage. But he appears to overlook the fact thatmany Crustacea, and all shrimps and crabs, as well as many mol-lusks, have organs of hearing. The German anatomist Willbelieves that insects hear only the stridulation of their own thinks that bees and ants are not deaf, but hear sounds soshrill as to be beyond our hearing. THE SENSES OF INSECTS. 29 an extremely delicate vesicle (bi) filled with a transparentfluid, and representing a membranous labyrinth. Thisvesicle is in connection with an auditory nerve (n) which. FIG. 22.—Ear of a locust (Culoptenus itulicus). seen fiom the inner side. T,tympanum; TR, its border; o, u, two horn-like processes; 6f, pear-shapedvesicle; n, auditory nerve: ga, terminal ganglion; st, stigma; m, opening, andm closing, muscle of the same: M, tensor muscle of the tympanum-mein-brane.—After Graber. CM-
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
