Page:A voyage round the world, in His Britannic Majesty's sloop, Resolution, commanded by Capt. James Cook, during the years 1772, 3, 4, and 5 (IA b30413849 0001).pdf/126

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to 37⅓; however we had no sooner passed it, than the mercury regained its former station of 41°. We also found that this difference of four degrees, very perceptibly affected our bodies, and concluded that the large masses of ice greatly contributed to refrigerate the general temperature of the air in these inhospitable seas. The waves dashed with great violence against the island of ice, as against a fixed body; sometimes they broke entirely over it, notwithstanding its height, which was not much inferior to that of the beforementioned piece, and we frequently saw the spray rise very high above it, a phænomenon, which, on account of the fair weather, had a remarkable fine effect. The sea-water by this means washed upon the ice, is probably congealed there, and serves to encrease the mass; a circumstance very materially conducive to ascertain the history of its formation.

Notwithstanding the coldness of this climate, our sloops were still surrounded by birds of the petrel genus, albatrosses and pinguins. We particularly observed a petrel, about the size of a pigeon, entirely white, with a black bill and blueish feet; it constantly appeared about the icy masses, and may be looked upon as a sure fore-runner of ice. Its colour induced us to call it the snowy-petrel. A grampus and several whales likewise made their appearance among the ice, and in these chilling regions served to vary the