TROUT-BREEDING IN WINTER 



177 



course, also, a zinc or lead, or even wood, tank 

 would do better, though not much. Besides, the 

 barrel is always useful long after my experimen- 

 talist has given up fish-breeding. Just, however, 

 as it is certain a kennel is necessary for a dog, or 

 a hutch for rabbits, so is the barrel or reservoir 



Fig. 79. Water Cask. 



necessary for the fish, and, as I have recom- 

 mended, does not come very high. 



We will now suppose the cask is fixed ; the next 

 thing is a covering or lid to keep out the dust. 

 Anything that suggests itself as suitable will do 



