Introduction to the science of language . ension of two mem-branous sacs at the sides of the neck. Some frogs havemembranous vocal chords : others two reed-like bodies,the anterior ends of which are fixed, while the posteriorends looking into the bronchi are free. We must wait for the microphone to confute or confirmthe statement of M. Langlois, of Freiburg, that antscommunicate with one another by means of audiblesounds. The recent observations of Sir John Lubbockseem to show the contrary. At all events, the soundsproduced by most insects are produced externally andnot internally. The stridul
Introduction to the science of language . ension of two mem-branous sacs at the sides of the neck. Some frogs havemembranous vocal chords : others two reed-like bodies,the anterior ends of which are fixed, while the posteriorends looking into the bronchi are free. We must wait for the microphone to confute or confirmthe statement of M. Langlois, of Freiburg, that antscommunicate with one another by means of audiblesounds. The recent observations of Sir John Lubbockseem to show the contrary. At all events, the soundsproduced by most insects are produced externally andnot internally. The stridulation of the cricket or grass-hopper is made by rubbing certain file-like organs againstthe edges of membranous drums on the wings. Thepitch of the sounds produced by the cricket is high,consisting of 4,096 vibrations per second. The shriekof the deaths-head moth is produced by the friction ofparts connected with the mouth and proboscis, the buz- Plate I. Superior Cornn-jr) J |JYjTj»\ \ Inferior CornuJ^hyr^Cart Crieo — View of the Trachea and Larynx. A A 2
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