From Sutherland he brought specimens of the finest clay, and reported a fine vein of heavy spar and "every symptom of coal." But in Caithness lay the loadstone which had brought Raspe to Scotland. This was no other than Sir John Sinclair of Ulbster, a benevolent gentleman of an ingenious and inquiring disposition, who was anxious to exploit the supposed mineral wealth of his barren Scottish possessions. With him Raspe took up his abode for a considerable time at his spray-beaten castle on the Pentland Firth, and there is a tradition, among members of the family, of Sir John's unfailing appreciation of the wide intelligence and facetious humour of Raspe's conversation. Sinclair had some years previously discovered a small vein of yellow mundick on the moor of Skinnet, four miles from Thurso. The Cornish miners he consulted told him that the mundick was itself of no value, but a good sign of the proximity of other valuable minerals. Mundick, said they, was a good horseman, and always rode on a good load. He now employed Raspe to examine the ground, not designing to mine it himself, but to let it out to other capitalists in return for a royalty, should the investigation justify his hopes. The necessary funds were put at Raspe's disposal, and masses of
