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1768 September 24.

This Morn the Pike appeard very plain and immensely above the clouds, as may well be imagin'd by its hight which Dr Heberden of Madeira who has been himself upon it communicated to us, 15,396 feet. The Dr also says that tho there is no eruption of visible fire from it, yet heat issues from the chinks near the top so strongly that a person who putts his hand upon these is scalded; from him we receivd among many other favours some salt which he supposes to be the true natron or nitrum of the ancients, and some native sulphur exceedingly pure, both which he collected himself on the top of the mountain, where large quantities, especialy of the salt, are found on the surface of the Earth.

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