A 



JOURNAL 



OF 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 



MARCH, 1809, 



ARTICLE I, 



A Letter on the Alterations, that have taken place in the 

 Structure of Rocks, on the Surface of the basaltic Coun- 

 try in the Counties of Derry and Antrim. Addressed to 

 Humphry Davy, Esq. Sec. R.S, By William Ri- 

 chardson, D.D.* 



SIR, 



JL Request you will be so good as to lay before the Roj^al The basaltic 



Society the following observations on the Natural History of c° un J*y near 



J *-*■'-. i -n- , r^ J the Giant's 



that part of Antrim, (contiguous to the Giant s Causeway,) Causeway ira 



which you and I examined so carefully together. I know port*nt to geo- 



not any country, that deserves so well to have its facts faith- 



fully recorded; from the important conclusions to which they 



lead. 



The basaltic area (taken in its whole extent) comprehends 



the greater part of Antrim, and the east side of Derry to a 



considerable depth. 



* Philos. Trans, for 1808, p. 187. 



Vol. XXII. No. 98— -March, 1809. M In 



