CHAPTER II 



THE FROG : EXTERNAL FEATURES AND 

 BODY-WALL 



The Common Frog of Britain is the species known in 

 Zoology as Rana temporaria. It is abundant 

 in summer in damp places, but in winter is less 



easily found, owing to the fact that it is then in a torpid 



Fig. 6. — The life-history of a frog. — After Brehm. 



1-3, Developing ova ; 4, newly hatched forms hanging to water-weeds ; 

 5, 6, stages with external gills ; 7-10, tadpoles during emergence of 

 limbs; 11, tadpoles with both pairs or limbs apparent"; 12, metamor- 

 phosis to frog. 



state, hidden in holes or buried in mud. In the spring the 

 warmth wakes the frogs and they congregate, croaking 

 loudly, and pair in the water, where the eggs are laid as a 



