. Animal studies. 382 ANIMAL STUDIES or gnats, undoubtedly hear by means of numerous delicate hairs borne on the antennae. The male mosquitoes (Fig. 235) have many hundreds of these long, fine antennal hairs, and on the sounding of a tuning-fork these hairs have been observed to vibrate strongly. In the base of each antenna there is a most elaborate organ, composed of fine chitinous rods, and accompanying nerves and nerve cells whose function it is to take up and transmit through the auditory nerve to the brain the stimuli received from the external auditory hairs. 296. Sound-making. —The sens
. Animal studies. 382 ANIMAL STUDIES or gnats, undoubtedly hear by means of numerous delicate hairs borne on the antennae. The male mosquitoes (Fig. 235) have many hundreds of these long, fine antennal hairs, and on the sounding of a tuning-fork these hairs have been observed to vibrate strongly. In the base of each antenna there is a most elaborate organ, composed of fine chitinous rods, and accompanying nerves and nerve cells whose function it is to take up and transmit through the auditory nerve to the brain the stimuli received from the external auditory hairs. 296. Sound-making. —The sense of hearing enables ani- mals not only to hear the warning natural sounds of storms and falling trees and plungiog avalanches, but the sounds made by each other. Sound-making among animals serves to aid in frightening away enemies or in warning companions of their approach, for recognition among mates and members of a band or species, for the attracting and wooing of mates, and for the interchange of information. TVith the cries and roars of mammals, the songs of birds, and the shrilling and calling of insects all of us are familiar. These are all sounds that can be heard by the human ear. But that there are many sounds made by animals that we can not hear—that is, that are of too high a pitch for our hearing organs to be stimulated by—is believed by nat- uralists. Especially is this almost certainly true in the case of the insects. The peculiar sound-producing organs of. Fig. 235.—A male mosquito, showing auditory hairs (a. h.) on the an- 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 Jordan, David Starr, 1851-1931; Kellogg, Vernon L. [from old catalog].
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