hundred fathoms beneath the surface of the sea, and to have risen a fifth or sixth part above the surface, measuring, at the same time, about a mile and a half in diameter. It has been shown by Dr. Lyster, that the marine ice contains some salt, and less air, than common ice, and that it therefore is more difficult of solution. From these premises, he endeavours to account for the perpetual augmentation of those floating islands. By a celebrated experiment of Mr. Boyle, it has been demonstrated that ice evaporates very fast, in severe frosty weather, when the wind blows upon it; and as ice, in a thawing state, is known to contain six times more cold than water, at the same degree of sensible coldness, it is easy to conceive that winds sweeping over islands and continents of ice, perhaps much below _northing_ on Fahrenheit’s scale, and rushing thence into our latitudes, must bring most intense degrees of cold along with them. If to this be added the quantity of cold produced by the evaporation of the water, as well as by the solution of ice, it can scarcely be doubted but that the arctic seas are the principal source of the cold of our winters, and that it is brought hither by the regions of the air blowing from the north, and which take an apparently easterly direction, by their coming to a part of the surface of the earth, which moves faster than the latitude from which they originate. Hence, the increase of the ice in the polar regions, by increasing the cold of our climate, adds, at the same time, to the bulk of the glaciers of Italy and Switzerland. Reasonings of this kind are supported by the greatest names, and countenanced by the authentic reports of the best informed travellers. Mr. Bradley attributes the cold winds and wet weather, which sometimes happen in May and June, to the solution of ice islands accidentally detached and floating from the north. Mr. Barham, about the year 1718, in his voyage from Jamaica to England, in the beginning of June, met with some of those islands, which were involved in such a fog that the ship was in danger of striking against them. One of them measured sixty miles in length. On the 22d of December, 1789, there was an instance of ice islands having been wafted from the southern polar regions. It was on these islands that the Guardian struck, at the commencement of her passage from the Cape of Good Hope towards Botany Bay. These islands were wrapt in darkness, about one hundred and fifty fathoms long, and above fifty fathoms above the surface of the waves. In the process of solution, a fragment from the summit of one of them broke off, and plunging into the sea, caused a tremendous commotion in the water, and dense smoke all around it.