MARINE BAROMETER. ■» A '■■ 



blow Steadily from the northward, and become variable. In Observation* 

 twenty.four hours more, the wind set in again to blow fresh to^JgrSTn"* 

 from the southward, the mercury having then returned to the correspon- 

 29,94, and it was presently up to 30,22 and 30,28. It kept ^^"^|=^^^^°f^' 

 nearly at this height for several days that the southwardly weather to be 

 wind blew fresh, but on its becoming lighter, and less steady expected after 

 in its direction, the mercury descended; and in the calm ^^^^"^J ^° j.^/ , 

 which followed, it had fallen to 29,90. This example affords meter, 

 clear proof of afresh wind from the sea making the mercury 

 rise, whilst a lig^ht wind off the land, with finer weather, 

 caused it to descend. 



6th. The calm was a prelude to a fresh gale ; but the 

 mercury began to rise at eight in the evening when it had 

 just sprung up; by the next noon it was at 30,10 when the 

 Avind blew strongest, and in the evening at 30,22. This gale 

 began as gales usually, if not always do upon this coast, in 

 the north-west quarter, and shifted round to SW and SSW ; 

 but quicker than I have generally seen them : there was no 

 rain with it, nor was the atmosphere either very hazy or 

 cloudy*. The mercury continued to rise till it had reached 

 30j25, and then was stationary as long as the xvind remained 

 between south and west ; but on its veering round to the 

 eastward of south, a second rise took place, and for forty 

 hours the mercury stood as high as 30,45, the wind being 

 then between SE by S and east : the Avcather was very dull 

 and hazy during the first half of these forty hours, but finer 

 afterwards. As the winds between SE by S and cast slanted 

 off the main land, this example seems to be in opposition to 

 the 4th, and leads me to think, that it might have been the 

 very extraordinary kind of haze, and perhaps some peculia- 

 rity in the interior part of the land abreast of the Isle of St. 

 Francis that in part occasioned the fall of the mercury with 

 south-east winds ; as much, perhaps, as the circumstance of 

 the wind coming from off the shore. 



After this rise in the mercury to 30,45, it fell gradually ; 

 but, for thirteen days, kept above 30 inches, the winds being 

 generally between SE and SW, but light and variable, and 

 the weather mostly fine. 



* I afterwards learned from Captain Baudin, that this gale was 

 much heavier in Bass' Strait than we felt it at Kangaroo Island. 



7ih 



