OF FISH IN GENERAL. 



Further remarks. 



ing continued to walk about the garden half an 

 hour longer, and returning to the pond, they hud 

 again the pleasure of seeing all the trouts re- 

 assemble at the ringing of the bell." 



A particular description of the organs of hear- 

 ing belonging to several species, is also given by 

 peofTrey, in his Dissertation sur 1'Organe de 

 1'Ouie, nor can it be thought that water is an 

 improper medium of sound, as daily experience 

 demonstrates, that sounds may be conveyed, not 

 only through water, but through the most solid 

 bodies. 



One of the cetaceous division (the phocaena) 

 having been dissected by Dr. Munro, this gen- 

 tleman, after a very nice anatomical investiga- 

 tion, observes, with regard to the hearing of fish, 

 <l that while they float upon the surface of the 

 ocean, impression is made on the several parts 

 of their ear in the same manner as in man.'" 



Many experiments have demonstrated, that 

 sounds are conveyed through water almost with 

 the same facility with which they move through 

 air. A bell which is rung in water returns 

 a tone as distinct as if it was rung in air. Der- 

 ham observed that it came a quarter deeper. 

 Naturalists in general had believed thai fish had 

 a strong perception of sounds at the bottom of 

 deep rivdrs; but the anatomical researches of 

 the above gentlemen clearly demonstrate the 

 auricular organ in these animals. Dr. Munro, 

 *n 1780, in order to judge of the effect of sounds 



i- O 



V 



