FIG. 167. Development of Frog 



1, 2, 3, eggs; 4, young immediately after hatching; 5, tadpole with external gills 

 6, 7, 8, 9, 10, and 11, further stages of development; 12, frog 



(From Baskett's Story of the Amphibians and Reptiles) 

 335 



