230 On the Connexion between 
action during some weeks. On 2lst and 22nd there was 
a violent storm from the south, with a rapidly falling 
barometer. 
Induction.—The eastern margin of a cyclone passing 
over the place of observation, which is in the northern 
hemisphere. 
2nd Fact.—On 28rd, 24th, and 25th, nothing recorded 
of state of weather: barometer 28°49. 
Induction.—Weather moderate or calm, centre of 
cyclone passing over. 
38rd Fact.—On 26th and 27th a violent storm from N.E., 
with a rapidly rising barometer. 
Induction.—The north-west quadrant of cyclone passing 
over, and cyclone progressing towards the #.S.L. 
The successive propagation of atmospheric disturbances 
indicated by the barometric curves leads us to expect the 
appearance of this cyclone a few days afterwards in the parts 
of Europe lying to the 8.E. of Iceland; and, accordingly, 
on the 24th we have its eastern margin at Genoa, the cyclone 
itself now moving to the 8.S.E. down the western coast of 
Italy towards Vesuvius and Etna. 
Its centre passes over France about 6 A.M. of the 25th, 
and the barometer falls unprecedentedly low. The second 
half of the cyclone follows, and ravages Europe until the 
ol si. 
During its transit over Europe an earthquake occurs, and 
igneous meteors prevail. 
1830, 16th May.—A sudden eruption of Etna, and a 
violent S.E. wind. A frightful whirdwind in desert of 
Africa destroyed a caravan. The same occurred in 1805, 
1811, and 1818, during eruptions of Etna; and in 1807 
during an eruption of Vesuvius~—Rey. W. B. Clarke, in 
vol. I., of Tasmanian Journal. 
