the tree-ferns far from water, and carries its young about on its 

 back, to which they are attached by their bellies. In the Kameruns 

 lives a Frog that lays its eggs in a foamy mass on the leaves of a 

 tree. When the larvae are developed the mass becomes slimy and 

 the tadpoles swim about it, and when a heavy rain falls they are 

 washed into pools of water lying at the bases of the trees. The foam 

 is probably produced as it is in culinary operations, by air being 

 entangled in it by a beating that the Frog gives the jelly with its 

 fc-et. The inclosed air may well serve in respiration. Compare 

 TOAD. 



UTILITIES. Among both civilized and savage men Frogs are a 

 culinary dainty. The edible European Frog is so much prized in 

 France that it is bred for the market in large preserves. In the 

 United States both the Bullfrog and spring Frog are sold in the 

 markets. In France and the United States the hind legs alone are 

 eaten ; they are known as "saddles" to American marketmen, and are 

 usually served at table fried. In Germany all the muscular parts are 

 served stewed, often with sauce. Frogs have enabled man to con- 

 tribute much to his knowledge of physiology. The tail of the tad- 

 pole, so frequently fed on by dragon-fly larvae and other aquatic ene- 

 mies, has great capacity of regeneration. The study of its re-forma- 

 tion has added to our knowledge of the regeneration of animal tissue. 

 The circulation of the blood, so readily seen by the aid of the micro- 

 scope in the web of the Frog's foot, is a classic and painless class- 

 room demonstration. Observations on the response of Frog-muscle 

 to stimuli led the great Italian physiologist Galvani to the discovery 

 of dynamical or current electricity, known to us as galvanic or 

 voltaic electricity. 



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