At page 440, Vol. II., of the Geol. Mag., is a very careful and accurate description, by Mr. A. H. Green, of certain markings on an exposed rock near Matlock, locally named the Bloody Stone. These markings he refers, though not without some hesitation, to the action of ice. I have lately visited Matlock, and twice examined this spot. On the first occasion the surface was wet from recent rain, on the second it was dry.