AMPHIBIANS 



laboratories. Thousands of them are used yearly for dis- 

 section and experimentation in universities, colleges, and high 

 schools. Although its average weight is not more than two 

 ounces, the leopard frog is the mainstay of the edible frog 

 industry. In 1908, 250,000 pounds of frogs' legs were sold 

 in the United States markets. A firm in the Oneida Lake 

 region of New York conducting a gross business of $15,000 

 per year in frogs sold one customer over $1,600 worth of 

 frogs' legs between June, 1915, and March, 1916. "An expert 

 can dress between 1,500 and 1,600 frogs per hour, but an 

 average rate is about 1,000 per hour" (Adams, C, and 

 Hankinson, T. L.: Trans. Amer. Fish. Soc, Vol. 45:163). 



Size. — The body of the male measures about 3 inches; the 

 female is larger. 



Range. — Very common in the whole of eastern and central 

 North Anaerica. 



Fig. 307. — Pickerel frog, Rana palustris. 



Pickerel frog, Rana palustris. — 'The pickerel frog resembles 

 the leopard frog in general shape and color, but is browner ; its 

 spots are more regular and rectangular than those of the 

 leopard frog and are not rimmed with white (Fig. 307). The 



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