14 



Occasioned by 

 a central y gale. 



Barometrical 

 observations. 



The Mercury 

 depressed by 

 squally land 

 breezes. 



But not by re- 

 gular land 

 bi'eezes. 



PHENOMENA AT SEA. 



dcnly, and bloAv from seaward, which did not happen. 

 On the arrival of several ships soon after, the cause of 

 the heavy swell rolling into the entrance of the river 

 was ascertained ; for these ships experienced a strong 

 gale from southward, which brought them within about 

 thirty leagues of the entrance of the river. This strong 

 gale from the southward had forced a heavy swell greatly 

 beyond its limit, although this swell must have met with 

 great resistance from the strong northerly wind blowing 

 against it. 



A long account from Capt. Flinders was recently read 

 at the meetings of the Royal Society, descriptive of baro- 

 metrical observations, made on the coast of New South 

 Wales, &c. It appears that the mercury continued at 

 greater heights with the wind from the sea, than with 

 land winds, on the coast of New South Wales. I have 

 sometimes observed the same effect in other places, par- 

 ticularly in June 1803 and July 1804, on approaching 

 the coast of Cochinchina. In passing from Sincapour 

 Strait to this coast in these months, with the regular 

 southerly wind, the mercury performed the motions of 

 two elevations and two depressions regularly, during the 

 twenty-four hours ; but fell ten hundred parts of an inch 

 each time (suddenly) when we came near the land. At 

 both times the wind from the sea abated, and was re- 

 placed with squalls from this alpine country. There was 

 much vapour over the land both times ; accompanied with 

 vivid lightning. 



During the fair weather season on the coasf of Malabar, 

 when regular land and sea breezes were daily experienced, 

 the mercury in barometers was not depressed by these 

 land breezes ; but appeared equally high as when the 

 breezes prevailed from the sea : — The two elevations and 

 depressions of the mercury were continued every twenty- 

 four hours on tlii^s coast; although not in equal quantity, 

 as in a steady wind at a considerable distance from laud. 



