A.MIMm'.IA 



:]10 



Fig. 151. Coininon tree f rocr 



Photograph l)y Millett T. 

 Thompson 



to frogdoin in a i)ond :>(! feet l>y l."», havinj; a <l«'i»tli of 2 feet of wattT." 

 As eggs of leopard frogs, pickerel frogs, and woo<l frogs can usually l»e 



gathered in any desired quantity, this wouhl 

 indicate ahuost imliniited }>(jssiltilities of 

 ]i\('-fot>d jiroduction. 



Ill addition to their uses, actual and 

 l»otential, as insect trajis, frogs hav** com- 

 mercial values which threaten their exter- 

 mination in many localities. In souie jdaces 

 small ones hring from Si to S'J..')(I per 1()(» 

 for fish l>ait. The frog is the animal luost 

 commonly used for laboratory studv the 

 world ovei- ; frogs used for this purpose 

 hring from .")() cents to $o per do/.en. More- 

 over, while they were rarely used for food 

 a few years ago, frogs' legs have now he- 

 come a well-known delicacy. "The meat 

 is white, delicate, and very wholesome and 

 palatable." Hence catching frogs for mar- 

 ket often yields good profit, and it affords a mildly humorous form of 

 outdoor sport. As these values come to he recognized, valuable sj^'cies 

 can ]>e protected by closed seasons (from the opening of spring until 

 after they spawn), local 

 waters can be kept stocked 

 to their full capacity, and 

 an abundant crop can be 

 secured each year. 



Some special problems. 

 1. in a pond stocked with 

 bullfrogs, how can we feed 

 so as to prevent cannibal- 

 ism and thus secure the 

 greatest numl)er of large 

 specimens from a given 

 area ? 



2. IIow^ can the largest number of toads be reared from a pool a foot 

 square and a foot deei)? (^^^■ have one record of :{1);JS from April to 

 August; the main foods were alga% dog biscuit, and fresh fish.) 



^3. Are toads beinc: exterminated from agricultural districts bv drain- 

 ing their breeding pools, by farm animals, and by the operation of fariu 



Fig. 162. Pair of si)otted salaiuanders 

 Photojjraph by Millett T. Thompson 



