GENERAL LIFE HISTORY OF THE TADPOLES 



27 



this spell, all through the season. The spawn site dried on 23rd June, 

 although there was always enough water for the tadpoles in the rest of 

 the pond. 



[b) 1948 (Fig. 6). This season was noteworthy as much for its 

 contrasts as for its resemblances to 1947. The winter had been mild 



10 20 30 

 APRIL 



10 20 30 

 MAY 



9 19 29 



JUNE 



9 19 29 

 JULY 



Fig. 6. Dagger Lane Pond, 1948 



Note in this year the fairly steady rise in weights until the later half of June. 



In this and the other graphs, some of the drop at the end of the season is due 



to the inclusion in the sample of metamorphosing tadpoles. 



and dry, and the season opened with the water level below normal. 

 In May, however, the weather changed and the rest of the season was 

 cool and rather wet. This is almost the reverse of the conditions in 1947. 

 The pond looked entirely different. There were no patches of 

 starwort, no visible algae, and the water was turbid and brown. Later 

 in the season, many rushes grew from the bed of the pond to form a 



