58 ON THE ANTENNAE 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 bur 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 Jnsorrmiis. 

 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 Articules." 



