a special “boulder committee” engaged in the investigation of this subject. The late Professor Sedgewick, of Cambridge (whose lectures the writer attended), was the first to notice that along the Holderness shore there were (as he says) “an incredible number of blocks of granite, gneiss, greenstone, mica, etc., etc., resembling specimens derived from various parts of Scandinavia.” {90} These, we now know, were dropped by the great Scandinavian glacier; and, along with the kinds of stone here named, there are also boulders of Rhombporphyry (the “Rhomben porphyry” of Norwegian geologists, from the neighbourhood of Christiana), Augite syenite, and several more, not of British origin. These boulders are now being searched for, and found in our own neighbourhood. On the other hand, there is the different class of boulders which were brought down by the native inland glaciers. These consist largely of igneous kinds. The rugged hills of the Lake district owe their origin to fire; and the boulders which the glaciers have transported correspond. The shap granite, for instance, which is probably one of the commonest of this class, comes from the shap granite bed of Wastdale, in Cumberland. Boulders of this rock, as Mr. Kendall tells us, “passed over Stainmoor in tens of thousands,” {91a} to visit us in Yorkshire and Lincolnshire. Other kinds are Felspar porphyry from Eskdale, in Cumberland, Andesite from Borrowdale, Granophyr from Ennerdale and Buttermere, Quartz, Basalt, and several more from the crystalline formations in the Lake district. Several boulders of these rocks have also been found in our own neighbourhood; and doubtless more remain to reward the explorer. {91b} I have dwelt at some length on this particular formation—the boulder clay—because it is the most ready to hand; it lies on the surface, in many parts around us, within the ken of the ordinary visitor to Woodhall Spa. It may give an additional interest to his rambles in search of health, to know that he may, at any moment, pick up a boulder which has travelled further, and passed through more strange vicissitudes, than he can well have done himself; perhaps, with Shakespeare, to read “Sermons in Stones,” and to moralise on the brevity of human life, with all its ailments, compared with those ages untold, through which the pebble in his hand slowly {91c} travelled on its long, laborious journey, to rest at length as a constituent element of the locality, where he himself is seeking relief and recreation.