lew) 
[Supplementary, published in “ Dosson’s” Australasian 
Cyclonology.] 
Havine now established a general rule for the motion of 
the Gales on the South Coast of Australia, we are enabled 
to interpret and explain the nature of isolated cases like 
the following, given by Sir James Ross in his account of 
the Exploring Expedition, carried on in the Hredus and 
Terror :— 
« 1840, August 12.—Noon, S.W. Cape of Van Diemen’s 
Land, bearing N.E. by N., distant 9 or 10 leagues. The 
wind increased so suddenly and violently that we could 
hardly take in our sails quickly enough, and in a few minutes 
were reduced to close-reefed mainsail. At 8 Pp.M., when 
blowing a perfect hurricane, the lee main-topsail sheet gave 
way, and in one instant the sail was rent into numberless 
ribbons, and soon entirely disappeared. The only sail then 
left on the ship, a new mainsail, was soon afterwards blown 
away. No canvas could stand against such a storm. At 
10 p.m. barometer 28°16, and although it then began to rise, 
we could not perceive the slightest abatement of the hurri- 
cane until after midnight, when it gradually moderated, and 
at the same time shifted from North to West. It continued 
to blow a storm of ordinary violence, with only occasional 
furious squalls, throughout the 18th, 14th, and 15th, when, 
haying been driven a great distance to the southward, we 
again stood in shore; we saw the land of Tasmania at 3 A.M., 
and anchored in Storm Bay at 1] P.M. 
This Cyclone was moying to the S. of E. At Circular 
Head (7), at the Hampshire Hills (8), and at Hobart 
Town (9), the wind shifts from N. to W., and then to S.W. 
On referring to the barometric curves for each of these places, 
