On the 2d 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
that volcano took place on the morning of the above day (September 2),
so as to leave no doubt of the accuracy of the conclusion. The dust had
thus travelled about 600 miles!