The Pipe-clay beds of Tipperary appear so closely to resemble in character and position the deposits of the Mountain Limestone district of North Wales and North Staffordshire, that it may not be out of place to record some observations made by Mr. C. D. Blake, on Newton Abbot, in 1862, and kindly communicated to me. There are also one or two previously published notices of these deposits, to which reference must be made.