In a letter to Sir John Hall, he says that he was become very fond of studying the surface of the earth, and was looking with anxious curiosity into every pit, or ditch, or bed of a river that fell in his way; "and that if he did not always avoid the fate of Thales, his misfortune was certainly not owing to the same cause." This letter is from Yarmouth; it has no date, but it is plain from circumstances that it must have been written in 1753.