224 FISH CULTURE 



Three sizes of ponds are necessary; one, the 

 smallest, for hatching eggs and carrying the 

 tadpoles 'to frog development ; a second, much 

 larger, to hold young frogs until they are over 

 two years old; the third and the largest, for 

 three-year-olds and over. All ponds should be 

 excavated and have a generous strip of grass- 

 covered ground around them. It is also desir- 

 able that there be a low embankment all around, 

 so that occasionally the water may be raised 

 and the entire area flooded to a depth of an inch 

 or two for a few hours, in order to keep the soil 

 wet, a condition dear to the heart of a frog. 



Each of the small ponds must be surrounded 

 by a fence so constructed that young frogs can- 

 not escape, and it would be well similarly to en- 

 close the large pond intended for mature frogs. 

 The creatures are nomadic in their habits, and 

 have been known to leave suddenly an appar- 

 ently very desirable body of water for no as- 

 certainable reason, and take up their quarters 

 in what, to the human mind, seemed an inferior 

 location. 



The fence need not be more than 2% feet 

 high, but on the top there should be a board or 



