riSi MARINE BAHOMETER. 



Observations those that camc fi'om between south and east causcil the nier- 



andinferences cury to rise and stand highest, as they had also done upon the 



tL^'coTrespon- south-coast, with the exception of the 4fh example. The 



dcot changes winds from NE kept the mercury up above 30 inches on the 



of wmd and ^^g^ coast, and caused it to rise after all other winds except 

 weatner to be , 



expected after those from the south-eastward : but on the south coast, the 



change in the mercury fell with them, and stood considerably below 30 



marine baro- jj^ches ; because, as it appears to me, they then came from 



off the land. During north-west winds, the mercury stood 



lower than at any other time upon both coasts ; and on both 



they came from off the land. 



Moderate winds from the south-westward, with fine 

 w-eather, caused a descent of the mercury on the cast coast ; 

 and during their continuance it was much lower than with 

 winds from the north-eastward ; but upon the south coast 

 it rose with south-west winds, and stood much higher than 

 when they came from the opposite quarter. For this 

 change I cannot see any other reason, than that the wind, 

 which blew from the sea upon one coast, came from off the 

 land in the other. 



Although the height of the mercury upon the south coast 

 of Australia was, upon the avei'age, considerably above the 

 medium standard 29,50, it was still greater upon the east 

 coast: I cannot fix it at less than 30,08 or 30,10, whereas 

 upon the south coast, I should take it at 30 inches ; both 

 subject to the probable error of one or two-tenths of an 

 inch in excess. This superiority seyros attributal to the 

 greater prevalence of sea winds upon the east coast, and 

 particularly of those from SE, which, vchenuU other circiim. 

 stances are equal, I have observed to raise the mercury 

 higher than any other on this side of the equator, analogous 

 to the effect of north-east winds in the northern hemisphere; 

 and perhaps also, the superiority may be in part owing to 

 the east coast having a more regular chain of higher moun- 

 tains running at the back of, and parallel to it, which 

 presents a greater obstruction to the passage of the wind 

 «ver the laad, than it meets on the south coast. 



(To be Continued.) 



