36 ECOLOGY AND LIFE HISTORY OF THE COMMON FROG 



about five million tadpoles. In spite of this, however, the pond later 

 in the season did not contain many. 



400 



lO 20 30 10 20 30 

 APRIL MAY 



8 



9 19 29 9 19 29 

 JUNE JULY 



Fig. II. Hospital Pond, 1948 



This pond was not discovered until 20th May, and the thin Hne is an 

 extrapolation. The graph shows good growth, but somewhat delayed 



metamorphosis. 



Cat Hill Pond 



This pond (Fig. 13) was only observed in one season. The pond, 

 like Lower Parkfield, is fringed with trees and has a permanent sub- 

 stratum of decaying leaves. Tadpoles were always scarce, but, as in 

 Lower Parkfield in the later years, grew to an exceptional size, one 



