34 ECOLOGY AND LIFE HISTORY OF THE COMMON FROG 



the scarcity was even more obvious, and it was necessary to spend some 

 time with the net before even ten tadpoles could be collected. The 



lO 20 30 

 APRIL 



O 20 30 

 MAY 



9 19 29 



JUNE 



9 19 

 JULY 



Fig. 10. Lower Parkfield Pond, 1949 



A similar graph to that for 1948. With few tadpoles in the pond, growth 



was good. 



contrast with 1947, when hundreds could be collected in one sweep, 

 was very striking. Fig. 9 shows that at no time were the differences 

 between the weights of the tadpoles from different collecting points 



