of Greenland.
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formed; or of Waters, of which it was coagulated: but Experience teaches me, that the blue Ice is the Concretion of freſh Water, which at firſt is white, and at length hardens and turns blue; but the greeniſh Colour comes from Salt Water. Blue Ice, when melted, and again frozen, turns white, not blue.'Tis obſerved, that if you put the blue Ice near the Fire and let it melt, and afterwards remove it to a colder Place, to freeze again, it does not recover its former blue, but becomes white. From whence I infer, that the volatile Sulpher, which the Ice had attracted from the Air, by its Reſolution into Water, exhales and vaniſhes. Though the Summer Seaſon is very hot in Greenland, It ſeldom thunders and lightens in Greenland.it ſeldom cauſes any Thunder and Lightning; the Reaſon of which I take to be the Coolneſs of the Night, which allays the Heat of the Day, and cauſes the ſulphureous Exhalations to fall again with the heavy Dew to the Ground. As for the ordinary Meteors, commonly ſeen in other Countries, they are viſible in Greenland; as the Rainbow, flying or ſhooting Stars, and the like. But what is more peculiar
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