



MP 



^„> 



Fig. 17.— Development of the frog. 1, eggs when first laid ; 3, eggs 

 at a later stage ; 3, egg containing emhtryo ; 4, newly hatched 

 larvsB or tadpoles ; 5, 5, 5, tadpoles with external gills ; 6 to 11, 

 later stages in the development of the tadpole ; 12, perfect frog. 



33 



