on the Marine Barometer. 249 
breezes from south and SW it ascended, and stood consi- 
derably above 30 inches ; with the wind at NE and NNE it 
also kept above 30 inches, but not so high, nor did it rise so 
fast, as when the wind was from SSW. From between south 
and east, the winds did not blow during these times. This 
example does not differ so much from those on the south 
coast as to be decisive of any thing. 
2d. The observations made during a stay of ten weeks at 
Port Jackson, in May, June, and July, 1802, are more in 
point than almost any other. Strong eastwardly winds were 
very prevalent at that time, and were almost always accom- 
panied with rain and squalls ; yet this weather was foretold 
and accompanied by a rise in the barometer, and the general 
height of the mercury during their continuance was 30,20; 
higher if the wind was on the south side of ESE, and lower 
if on the north side of east. The winds from south and SSW;, 
which blow along the shore, kept the mercury up to about 
30,10, when they were attended with fine weather, as they 
generally were ; but if the weather was squally, with rain, 
it stood about 29,95. During settled winds from between 
WNW and SW, with fine weather, the mercury generally 
stood very low, down at 29,60 ; * and what is more extraor- 
dinary, when these winds were less settled, and the weather 
dull, with rain occasionally falling, the range of the mercury 
was usually between 29,80 and 30,10 ; nearly the same as 
* My friend Colonel Pate rson, F. R. S. commander of the troops at Port Jackson, 
in judging of the approaching weather by the rise and fall in his barometer in the winter 
season, told me, that he had adopted a rule directly the reverse of the common scale. 
When the mercury rose high, he was seldom disappointed in his expectation of 
rainy, bad weather; and when it fell unusually low, he expected a continuance 
of fine, clear weather, with westwardly winds. 
Kk 2 
