METEOEOLOGICAL PEBIODICITT. 177 



only 1-lOth inch here while there was 1 inch at South Head- 

 Tasmania has a very different climate from ours, quite insular, 

 and there is no doubt a two years' period did exist for many years 

 in Tasmania, but they never have really dry seasons there. The 

 evidence of the nineteen years period here is I think so strong 

 that it does not admit of much doubt. 



[Three diagrams,] 



