934 On the Connexion between 
“ 
1819, Avaust.—Bagdad. An earthquake after extreme 
heat, and then a storm, an event quite unprecedented. The 
river rose 7 feet, the water being ved and offensive. 
1820, DECEMBER 29th—Zante. Atmosphere frightful, 
wind 8.8.H.; barometer 27°40, like an American hurricane. 
At midnight three violent shocks of an earthquake. A 
sudden calm, and then the storm redoubled. On night of 
80th a new hurricane, such as I believe no one (here) ever 
before experienced; wind S.E. Probable origin of earth- 
quake in the sea.—Edin. Phil. Journal. 
1821, 20th, 25th Decemper.—Earthquakes in Iceland, 
and at Mayence, on the Rhine. On Christmas Eve, after a 
long continuance of stormy weather, the barometer sunk so 
low in Europe that the attention of meteorologists was 
strongly drawn to the circumstance. Professor Dove, of 
Berlin, from a consideration of the meteorological registers 
kept at various places in Europe, (see Annals of Phil.,) 
made it appear that an explanation of all the phenomena 
was afforded by the assumption of one or more great rotary 
currents or whirlwinds. From this epoch may be dated 
the commencement of the Science of Cyclonology. (See 
Volcanic Eruptions, under date 1821.) 
On the 25th December, 1821, a Troughton’s mountain 
barometer at the Royal Observatory of Greenwich sunk as 
low as 27°89 inches. (Pond’s Greenwich Obs.) A heavy 
rain of some hours, with wind at south east, preceded this 
fall ; anda gale at north-west followed, in which the mercury 
rose a few tenths. 
1823.—Sietly. The shock of the 5th March was followed 
by a tremendous night of rain, thunder, snow, hail, and 
wind. 
1828, 21st FeBruary.—Barometer at Geneva 28°69. 
During the 19th, 20th, 2]st and 23rd February, furious 
tempests raged throughout the south of Europe; and on 
