t 



( 20I ) 



takes its food. From its fktfK is ex- 

 creted a (limey fubftance, which ren- 

 ders it necefTary to change the water 

 daily, or at leaft every other day : for 

 this purpofe a cock is placed in the bot- 

 tom of the trough, whence the water is 

 drawn off, and the trough fcowered. 

 On thefe occafions the fifh is frequently 

 fuffered to lie motionlefs, without wa- 

 ter, for feveral hours ; but if he i$ 

 touched in this condition, the fhock 

 communicated is not lefs violent than 

 ufual. The manner of their generation 

 is uncertain. Several attempts have 

 been made to convey thefe Fifh to Eu- 

 rope ; but the quantity of frefh water 

 requifite to fliift them as often as is 

 neceffary, together with the bruifes 

 which they mull inevitably fuftain from 

 the motion of the fhip, have hitherto 

 rendered them unfuccefsful. 



Befides 



