Letters concerning the northern coast of the County of Antrim [electronic resource] : Containing such circumstances as appear worthy of notice respecting the antiquities, manners and customs of that country. Together with The natural history of the basaltes, And its attendant fossils, In the Northern Counties of Ireland. The whole illustrated by an accurate map, And engravings of the most interesting Objects on the Coast. In two parts. By the Rev. William Hamilton, B. D. and M. R. I. A. In these letters is stated a plain and impartial View of the Volcanic Theory of the Basaltes.