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The duke had communicated his discovery to the queen without disclosing his name, which he desired might be concealed: her majesty believed the particulars, which were confirmed by her spies at Paris, as well as by the evidence of sir John Maclean, who had lately been convoyed from France to England in an open boat, and apprehended at Feldstone.
It is sometimes called FELDSTONE, and when the crystals of feldspar are conspicuous it becomes FELDSPAR PORPHYRY. All these and other varieties of granite pass into certain kinds of trap a circumstance which affords one of many arguments in favour of what is now the prevailing opinion, that the granites are also of igneous origin.
The contemporaneous volcanic rocks intercalated in this Upper Old Red consist of feldspathic lavas, or feldstones, with associated tuffs or ashy beds. The lavas were some of them originally compact, others vesicular, and these last have been converted into amygdaloids. They consist chiefly of feldstone or compact feldspar. The Pentland Hills, say Messrs.
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