3*28 On Atmospheric Deposits 
in lat. 7° long., 105° W., more than 1200 miles distant 
from the volcano, in a direction opposite to that of 
Jamaica. 
The ashes brought to St. Anne’s from the eastward 
must have been occasioned by the shower having been 
carried by the upper westerly current, and dropped upon 
the trade-wind below by the force of gravity, and so 
borne westward again towards the point whence they 
emanated. Since the facts in this case were made known 
by various informants, Mr. Darwin has shown* that the 
eruption extended from Coseguina in 13° N., to Acon¬ 
cagua in 32° 30' S., and to Osorno in 40° 31' S., all on 
the same day, 20th of January, a distance of 3180 miles. 
Enormous quantities of ashes and pumice,” he says, 
“ were ejected, and the air was darkened by Coseguina, 
“ which had been dormant 26 years.” In addition to the 
linear distance, we must calculate the range northwards 
to San Salvador, making the affected space from south to 
north 3300 miles, and from east to west 2000. 
In the year 1837, on the 8th February, black dust, 
similar to that which fell in 1755, again fell in Scotland. 
It was observed in Fifeshire, and particularly on Lough 
Earne. It was supposed to have come from Iceland. 
Over a wide space in the China Sea dust was carried 
in 1838, as I am informed by an eye-witness, to a con¬ 
siderable distance from one of the Bashee Islands, just 
before seen in eruption. In August, 1774, Captain Cook 
found Tanna, one of the Hebrides, in eruption, and 
mentions the ashes that came from it. Mr. Bennett also 
mentions*!* an eruption of Tanna from the 20th to the 
25th April, 1830, and that his ship was covered with 
ashes that fell from it. 
* Memoir on Volcanic Phenomena of S. America, Geol. Trans, 
v. 610. 
t Asiatic Journal, 1832, pp. 128 -Sc 130. 
