32 PRACTICAL TROUT CULTURE. 



have greatly modified, was devised by Mr. Thad- 

 deus Norris, of whom we purchased the place in 

 1867. At the time of purchase, pond No. 1 only 

 was completed, though work upon the banks of 

 the other ponds had been commenced. Four years 

 have we been engaged in perfecting them, and it 

 is only within the past season that our improve- 

 ments have been entirely completed. 



Fio. 1. 



The spring (marked S on the plan) from which 

 all the water is obtained is of a capacity of about 

 twelve hundred gallons per minute, constant in 

 quantity, throughout the entire year. The tem- 

 perature of the water is 50 ; never varying more 

 than one degree in the heat of summer or depth 



