74 ECOLOGY AND LIFE HISTORY OF THE COMMON FROG 



Table i (continued) 



did not conform to the statistical ideal of "random." Ponds that did 

 not contain spawn were just as important as those that did, and the 

 usual procedure was to walk across the fields observing every pond 

 reasonably accessible. 



It was unusual for a pond to have breeding frogs every year. In 

 Table i, Large Totteridge is shown as having spawn in all the nine 

 successive years of observation, but since that time frogs have deserted 



