Trout Breeding. 115 



cases of a rise in the temperature the large fish are the 

 first to suffer. 



LARGE SINGLE PONDS. 



It is difficult to give directions which will be suit- 

 able for all places, but I will repeat that a dam in a 

 ravine is the worst form. In such a place it seems bet- 

 ter to make a small dam, and lead the water from it into 

 ponds at the side of the ravine, and let the floods go 

 down the old channel. My own ponds, at Honeoye 

 Falls, Monroe County, New York, were made in a 

 piece of low, flat land, with a plough and road scraper, 

 using the earth, gravel, etc., taken out to fill up around 

 the ponds. Afterward they were finished with pick 

 and shovel, and a dry stone wall laid around them 

 merely to hold the banks, but they were small, only 

 6ox?5 feet and 5 feet deep. The first one built was 

 laid in cement,, but was no better than the others. In 

 some places there is muck enough to pay for the dig- 

 ging in manure ; but if the water can be kept off, such 

 ponds are not expensive. Here is the cost of one of 

 mine of the dimensions above given : 



Two men and team two days $10.00 



One man with shovel two days 3.00 



Team and man hauling stone three days.. . 10.50 



Man laying wall three days 4.50 



Screen boxes 3.00 



Man one day ditching ....... 1.50 



Total $32.50 



The cost of stone was not added, as there was a 

 quarry on the farm. 



