On the 2nd of September, 1845, a quantity of volcanic dust fell in the
Orkney Islands, which was supposed to have originated in an eruption of
Hecla in Iceland. It was subsequently ascertained that an eruption of
Hecla took place on the morning of the above-named day, so as to leave
no doubt of the justness of the conclusion. The dust had thus travelled
about 600 miles!
------------------