In the February Number of this Magazine, Mr. Hatchings announces that he has identified as Cordierite the mineral which constitutes the conspicuous “spots” in the metamorphosed slates of Wasdale Beck near the Shap Granite.inthis connection, it may be of interest to record another occurrence of the same mineral, discovered by Mr. Marr and myself a year or two ago. It is in the metamorphosed Skiddaw Slates of the Caldew Valley in Cumberland, the locality of our specimens being south-west of the farm of Swineside. The cordierite occurs there in crystals of quite irregular shape, charged with various inclusions, original and secondary, and stained with limonite.