MR. O. G. S. CRAWFORD, in NATURE of May 5, p. 602, criticises what he terms my “speculations” concerning the distribution of megalithic monuments in England and Wales. I am sorry that apparently he did not trouble to read the paper, and to see exactly what I had to say on the matter. My aim was to urge that there is a connexion, in England and Wales, between the distribution of megaliths and certain geological formations, the Granite in Devon and Cornwall, the Chalk in Dorset and Wilts, the Lias in Gloucester and Oxford, and so forth. In this I found that I had been anticipated in part by Mr. Crawford himself. Where we differ, of course, is in the interpretation of the evidence.