Kerguelen’s voyage to the north. 746 ceived in the northern diftricts; after thefe a confiderable mountain, called Krafle, began with a dreadful noife to vomit forth fmoke, fire, allies, and flones. Horrible fight for thofe who dwelt in the neighbourhood, and particularly for two travellers who happened to be paffing below the mountain ! To them however, from there being no wind, not any accident occurred, the ignited flones caft up by the mountain falling back perpendicularly. It continued burning for two or three years; and, in 1728, the fire communicated to fome mountains of fulphur fituated near the volcano ; they burnt for fome time until the mineral matter had melted, and formed a river of fire which run from the mountain towards the fouth. The inhabitants eflablifhed on the borders of a great lake, called My-Varne, three leagues diftant from the mountain, were apprehen- llve of this burning river, which continued advancing towards their abode. They took away the wood of their houfes to remove to fome other fpot; at length it continued its courfe, and proceeded to the farms and the lake before mentioned. There it over- turned, burnt, and confumed a farm, called Reikchild, its meadows, and two other farms, named Groff and Fragrenes, fituated on the lower fhore of the lake. It at length difcharged itfelf into the lake My-Varne with a frightful noife, caufing an ebul- lition, a frothy whirlpool in the higheft degree horrible.” From this defcription of Mr. Horrebow, who certainly did not exaggerate, for he was very much inclined, being a Dane, to leffen the phyfical vices of an ifland belonging to Denmark, fome- judgment may be formed of the volcanic eruptions, and earthquakes, to which Iceland is liable : it is certainly true, that it .is fubjedl to all forts of cataftrophes. Mountains are feen to fink in an inflant, and lakes form ; Joekelen, or ice mountains, to melt, and throw out fire, uniting the double horror of flood and conflagration. Springs of hot water are found in feveral diftricts of Iceland. Meffrs. Horrebow and Anderfon agree upon the Angular efl'efts of many of thefe fprings, but the molt curious of all thefe fountains is that fituated near a farm called Raycum, in the diftrift of Huzevig, There are three hot fprings diftant from each other about thirty toifes ; the water boils in each alternately. They rife from a flat furface ; two of them throw up water from the midft of ftones to the height of eighteen inches : the third has a round opening of the fize of a brewer’s vat, and throws up water ten feet high. What is furprifing, thefe fprings only play alternately, and after having boiled three times,. Tvhich ferves as a notice to thofe who are nigh to retire. It is remarkable, that when a ftone of whatever dimenfions is caft into them, the force of the ebullition is fo great as to throw it back. M. Olave informed me, that the inhabitants of the neighbourhood of thefe hot fprings ufe them for cooking their meat and fifth, and that travellers heat water in them for making tea. Marble is found in fome parts of the ifland, and cryftal frequently in the rocks. The cryftal of Iceland pofleffes the faculty of doubling the objetts which are feen through it. Mr. Florrebow conceives it to be rather a lapis fpecularis than a cryftal. Fie is miftaken, as well as others, who have imagined it, from its leafy tiffue, to be a fort of talc. Some have reckoned it in the number of felenites; but it is demonftrated to be a calcareous fpar, which care mull be taken in ranking with other fubftances refeinbling it. The excellent work of IFuygens on light may be confulted upon this fubjeft with the Memoirs of the Academy of Sciences, for the year 1710, p. 341. Iceland contains in its bowels mines of copper and iron ; and I myfelf have often found pure maffes of thefe metals in the mountains. M. Horrebow certifies, that large lumps of filver are frequently found almoft at the furface of the earth ; this I never faw, nor ever heard of any body’s finding. Brimftone

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