Perceiving then I could not so well rely on the Draught of the Giants Causway that was first taken, and printed about Four Years since in the fore-mentioned Transaction, as being done by the Hand of one who was no extraordinary Artist, tho' the best that could be then had; I proposed the last Summer to some Philosophical Gentlemen here in Dublin, that we should imploy, at our common Charge, one Mr. Sandys, a good Master in Designing and Drawing of Prospects, to go into the North of Ireland, and upon the Place take the genuine and accurate Figure of the whole Rock, with the natural Posture of the Hills and Country about it for some distance, accordingly we sent him away with such In (212) structions as I drew up for him, and he returned soon after with a fair and beautiful Draught very expressive of each Particular we desired; an exact Copy of which my Brother lately sent over to the Royal Society, by one of their Worthy Members, and my highly esteemed Friend, the Honourable Francis Roberts, when he went last from hence, this I believe you'll find hanging up in their Repository at Gresham-Colledge, to which I must desire you to have recourse, for the whole Map was too large and bulky to be inclos'd in this Letter*: However, I have sever'd from it one of its most instructive Schemes, as being the chief and most essential part of it all, and have here sent it you; from whence with the Help of the Description already published, you will easily frame to your self a just Idea of the most singular and remarkable Properties of this Stone of the Giants Causway.