GROWING THE LARGE TROUT. 221 



interval between i p. m. and 4 p. m. being the worst 

 time for the water, — will often save them. The other 

 remedy is to reservoir part of the water in the stream 

 above the trout during the cool of the night, and let it 

 on by degrees in the hottest part of the day; this will 

 answer to some extent, when the days only are hot. But 

 if the heat and drought are extreme and long continued, 

 and nights and days are both hot, then neither ice nor 

 reserves of water will save your trout in an overstocked 

 pond, and you must lose them. I will merely add that 

 a plethoric condition of the fish, and an uncleanly pond, 

 increase very much the dangers of the dry season. 



3. Guai-d against heated ivater. This point is some- 

 what related to the last, inasmuch as the water is usu- 

 ally the hottest at the dryest time, and the warmer it 

 is the less stock it will keep. But there is also danger 

 of the water heating up enough to kill the fish, even 

 when there is plenty of it and the season is not par- 

 ticularly dry. This point has also been discussed on 

 page 12, to which the reader is referred. I will re- 

 peat here that the extreme limit of danger is variable, 

 depending upon the quantity, quality, and rapidity of 

 the water, and also upon the degree of exposure to 

 the sun, and the condition of the fish. 



The trout exhibited by the writer at the Mechanics' 

 Fair, at Boston, in 1869, appeared easy with a medium 

 supply of water at 68^ At 70° they were a little dis- 

 tressed, at 73° much distressed, and breathing at the 

 rate of 100 times a minute. Mr. Stephen H. Ainsworth, 

 in a letter to the writer, says that 68° is the highest 

 temperature that his trout do well in, at 70° they stop 



