melt the ice accumulated in winter, by causing a constant thaw. This sunshine continues at the pole till the 1st of April, and prevents the forming of ice until that time. But at 70°, there is, through most of these months, a short period of night, sufficient for the atmosphere to cool. This will be more obvious, if we consider the powerful influence of the ice, during this absence of the sun's rays, and remember the great change of temperature which occurs in our climate immediately after sunset at the close of a sunny day in February or March. This interval of night in latitude 70°, counteracts most of the effects of the sun's heat in the day time. Nearly as much ice forms in the night as is thawed during the day. This accounts for the 'icy hoop.' There is not summer enough to dissipate the ice of winter; while at the pole there is summer enough to dissolve a globe of ice." "But, sir," rejoined Mr. Slim, "if this 'icy hoop' exists, how do you expect to pass it? or, if it is impassable, what use is there in encountering the risk of navigating unknown and dangerous seas, in a high and boisterous latitude?" "I mean, sir, to ascertain whether it be passable or not. I think it probable that the influence of the summer heat may so far weaken it as to admit of broad openings being formed by the pressure of wind or currents, and if I can find an opening of but a mile wide, I shall dash through it, at all hazards." "And a pretty condition we shall be in, Capt. Seaborn, if the ice closes the passage after we have dashed through it!" replied Mr. Slim. "We shipped with you, sir, for a sealing voyage; not for a voyage of discovery." "You will please to remember, Mr. Slim, that I am expressly authorized by the articles, to cruize and seek for seals wheresoever I may judge expedient and proper, and that any opposition to my authority will involve the forfeiture of your share--recollect that, Mr. Slim."