Volcanic Eruptions and Hurricanes. 229 
Since 1st January violence of eruption has been decreasing. 
The volcano was afterwards quiet until 26th June, 1822, 
when new eruptions occurred, with showers of ashes and 
currents of lava. On the north part of the island frequent 
earthquakes had been felt. 
In vol. iii. of the Annals of Philosophy are given. Dr. 
Thorsteinson’s daily observations of the mean height of the 
barometer for December 1821, January and February 1822, 
taken at Naes. In vol. iv. are tables of observations for the 
same period made at Newcastle-upon-Tyne by Mr. Losh, 
and at London by Mr. Howard. Mr. Howard gives the 
maximum and minimum observations for each day, making 
in all 180 readings: Mr. Losh gives three daily readings, 
at 9, 2, and 10 respectively, making 270 readings. I have 
deduced the mean daily height from each series, and pro- 
jected the three curves corresponding to the mean daily 
height of the mercurial column at Naes, Newcastle, and 
London for the three months. ~ 
Several interesting results would arise from the comparison 
of these curves, but that which more immediately pertains 
to our subject is, that every definite well-marked atmospheric 
disturbance in Iceland, during these three months, was fol- 
lowed shortly afterwards by an analogous disturbance in 
Britain ; proving that, so long at least as the volcanic action 
lasted, the atmospheric disturbances arising from that action 
in Iceland were successively propagated to Great Britain in 
a few days, and with comparatively slight modifications. 
With the knowledge which we now possess of the phe- 
nomena attending great storms, several important and well- 
founded inferences spring from the meteorological facts 
recorded during this period of unusual volcanic activity. 
1st Fact.—On evening of 19th December, a great volcanic 
eruption began, and continued with irregular but decreasing 
