LI. Geological observations on the County of Antrim, and others in the North-east part of Ireland, in an attempt to arrange the numerous facts, stated by Dr. W illiam R ichardson to the Royal Irish Academy, and to the Royal Society, and those recently published in the Rev. J ohn D ubourdieu 's statistical survey of Antrim, by Dr. W illiam H. D rummond , in the preface and notes to his poem "The Giant's Causeway," &c. and to refer each of them to one of four principal strata; separating such as belong to the alluvia: with incidental facts and observations respecting other districts, &c. &c.