JOURNAL 



O F 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 



DECEMBER, 1801. 



ARTICLE I. 



Ob/erveftions on the Bofaltic Coaji of Ireland. In a Letter from Wm. RichardsON, D,D, 

 to the Honourable Geo. Knox, M, P, Communicated by Mr. Kno>!. 



DEAR SIR, 



W. 



HEN you left Portrufh in Auguft laft, you lamented that you could not accompany 

 me on two expeditions I was then preparing for, one to explore our coaft in fearch of the 

 Whynn Dykes (we call them Gaws) which ifluing from it at right angles proceed nearly 

 due northward, and crofs moft of the Hebrides, cutting through all fubftances indifferently. 



I found four at Bengore Head, in addition to the two at the Giant's Caufeway we 

 examined together, and whofe internal prifmatic conftru£lion, and other circumftances 

 aflonifhed you fo much; I found alfo four at Fairhead, making ten in all, every one of 

 which that I could get accefs to, differed in fome material points from all the others. 



Mr. Mills (Phil. Tranf, 1790,) mentions feveral of thefe Whynn Dykes he met with 

 in the Scotch iflands, but he does not fcem to have examined tbem with attention, or no- 

 ticed their differences, if they really differ from each other as ours doi 



As foon as I am able to explore the coaft from Dunscurich to Ballintay, where 

 poffibly I may find more, I will (according to my promife) give you an accurate account 



Vol. V. — December 1801. T t of 



