58 



ON THE ANTENNA AND HEARING OF INSECTS. 



Weaken the understanding which restrains or opposes it, and it will 

 immediately revive to take the reins of the organic machine, and pre- 

 vent it from destroying itself. It also manifests itself particularly in 

 maternal cares. Even when in health, if we would discover the 

 original instinct of a man, it is sufficient to deprive him of the intel- 

 lectual faculties, or to weaken the latter for a moment, and the internal 

 impressions will predominate spontaneously, as in diseases. 



From the same cause we often experience in sleep the announce- 

 ment or the indication of the state of the body, which is manifestly 

 the voice of instinct. It is certain that our internal impressions being 

 more easily perceived in silence, and in the obscurity of external 

 impressions, they present themselves in many dreams ; thus inflam- 

 mation declares itself by the image of a great fire ; the overflowing of 

 the sympathetic or serous fluid, by the idea of inundation or submer- 

 sion, &c. These observations, which may be traced back to the time 

 of Hippocrates and Aristotle, are again confirmed by a thousand daily 

 examples. (Aristotle, de Divinat. ex Somnio,et Hippocr. de Jnsomniis. 

 lib.) 



ON THE ANTENNA AND THE HEARING OF INSECTS. 



BY M. H. STRAUS- DURCKHE I M, MEMBER OF THE INSTITUTE, PARIS.* 



Anatomy of the Antennae of the Cock-chafer magnified eight times. 

 * Translated by the Editor, from the French work " Animaux Articulh." 



