SIX STAGES IN THE DEVELOPMENT OF THE GRASS FROG. 



1. The spawn shortly after deposition ; each eSS contained in an envelope of mucus. 



2. The shape of some of the tadpoles distinguishable ; the mucus breaking up. 



3 (Magnified). The branchiae (gills) of some of the tadpoles visible. Those possessing them are now frcs in 



the mucus and feeding on it. 



4 (Magnified). The gills and swimming tails well developed. 



5. The gills atrophied. The tadpoles feeding on vegetation. 



6. At the top of the picture is a four-legged frog tadpole, who will shortly leave the water, when his tail will be 



gradually absorbed. Next below is a black toad tadpole with rudimentary hind legs, resting on a frog 

 tadpole with developed hind legs. 



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