FROGS AND THEIR RELATIVES 119 



keeping obnoxious insects under control." HEGNER'S " Col- 

 lege Zoology." 



Frogs, in addition to their value as insect destroyers, are 

 also of some value to man as food. It is said that in the 

 United States about $50,000 is obtained annually by the frog 

 hunters for their catch, and frog farms are now profitably 

 maintained in several states. Frogs are also used as fish bait, 



