8 AUSTRALIAN WEATHKK. 



I have already stated, that taking a large number of anticyclones 

 on their passage over Australia the daily translation eastward is 

 four hundred miles ; and it is a matter of considerable interest to 

 ascertain if they maintain the same velocity of translation over 

 the ocean. I have been so far unable to trace any connection 

 between the variations in the barometers at Buenos Ayres and 

 Sydney, and infer from this that the great mountain chain of the 

 Andes so breaks up the anticyclones that the curves are not alike. 

 The only other place in like latitude for which I have daily 

 barometer readings, and these for only one year, 1890, is Natal. 

 Fortunately there is an obvious similarity in the curves. ] have 

 compared thene with Sydney by having the two plotted on the 

 same scale and taking the difference in the times at which marked 

 points of high and low barometer readings pass the two places. 

 There are 



In January 5 cases with a mean of 1 3 days 

 February 5 16 



March 5 15 



April 3 18 



May 4 12 



June 3 14 



July 4 16 



August 5 ,, 17 



September 5 ,, 14 



October 4 14 



Novembers 17 



December 5 15 



Total 51 cases Average No. of days 15'08 



The greatest number of days for the translation of the waves 

 from Natal to Sydney is eighteen days for April, which makes 

 the daily velocity of translation three hundred and eithty-two 

 miles ; the least number of days in any month is twelve, in May, 

 which makes the velocity of translation five hundred and seventy- 

 three miles per day. The average rate for all the months is 

 fifteen days, which is equal to a velocity of translation of four 

 hundred and h'fty-eight miles per day. 



