PISHES. 287 



live well in tanks, and become very tame and even docile. 

 They can be fed with small red worms and young water- 

 snails. They will also, after a time, learn to take bread, 

 and like it too ; but care must be taken not to give them 

 too much. 



The Golden Carp love warm water; many of them are 

 reared in waters which receive the waste steam from facto- 

 ries. In the Botanical Gardens, Regent's Park, in the water 

 green-house containing Ficloria regia, are immense num- 

 bers of Golden Carp, luxuriating and breeding freely in very 

 warm water. At Hampstead too, at certain parts of the 

 day, the waste water is liberated from the engine water- 

 works into the adjacent pond. At these times some com- 

 mon Carp are seen congregating under the pipe, evidently 

 enjoying the warmth, and dispersing after the temperature 

 of that part is assimilated with the rest of the pond. 



Loach, Minnows, Tench, and Gudgeons, have their va- 

 rious beauties, live pretty well in Aquaria, and are worth 

 observing ; but beware of the voracious Pike, for at a very 

 early age he is fatal to fishes of larger bulk than himself. 



Luminosity of Fish. 

 This is a subject upon which naturalists have not yet 



