OE, THE HOME-CULTURE OF FRESH-WATER PLANTS. 



boldt and Bonpland perceived fishes thrown up alive 

 and in apparent health from the bottom of a vol- 

 cano, along with water heated to a degree that raised 

 the thermometer to 210! being only 2 below boil- 

 ing point. This proves, at all events, that water of a 

 tepid heat would be highly favourable to Gold Pish, 

 and perhaps to many other species ; and if the breed- 

 ing and rearing of fish for the table were more at- 

 tended to, it might be found that all the fresh-water 

 species could be made to multiply more abundantly, 

 grow more rapidly, and attain a larger size, by the 

 judicious introduction of warmth to parts of ponds 

 or streams, which might be easily effected near to 

 dwellings where forcing-houses are in operation, by 

 means of an extended range of hot-water or steam 

 pipes being made to pass through the ponds, or parts 

 of the adjacent streams.* 



Pennant tells us that in China every person of 

 taste keeps Gold Pish, and that they make the 

 crossing of the several distinct species quite a 

 scientific business. They also succeed in taming 

 them, so that they will come to the call of a whistle 



* Fish also bear a great degree of cold, though it is not pre- 

 tended that they flourish in it ; it is said that Perch that have 

 been frozen up in solid ice have recovered when thawed before 

 the fire. 



