It is very difficult to work when it is so cold, because of the shortness of breath it causes. A man can only do a quarter of his accustomed work; iron implements become impossible to touch; if one is taken up without precaution, it causes a pain as bad as a burn, and pieces of skin are left on it. The crew, confined to the ship, were obliged to walk for two hours on the covered deck, where they were allowed to smoke, which was not allowed in the common room. There, directly the fire got low, the ice invaded the walls and the joins in the flooring; every bolt, nail, or metal plate became immediately covered with a layer of ice. The doctor was amazed at the instantaneity of the phenomenon. The breath of the men condensed in the air, and passing quickly from a fluid to a solid state, fell round them in snow. At a few feet only from the stoves the cold was intense, and the men stood near the fire in a compact group. The doctor advised them to accustom their skin to the temperature, which would certainly get worse, and he himself set the example; but most of them were too idle or too benumbed to follow his advice, and preferred remaining in the unhealthy heat. However, according to the doctor, there was no danger in the abrupt changes of temperature in going from the warm room into the cold. It is only dangerous for people in perspiration; but the doctor's lessons were thrown away on the greater part of the crew. As to Hatteras, he did not seem to feel the influence of the temperature. He walked silently about at his ordinary pace. Had the cold no empire over his strong constitution, or did he possess in a supreme degree the natural heat he wished his sailors to have? Was he so armed in his one idea as to be insensible to exterior impressions? His men were profoundly astonished at seeing him facing the 24 degrees below zero; he left the ship for hours, and came back without his face betraying the slightest mark of cold. "He is a strange man," said the doctor to Johnson; "he even astonishes me. He is one of the most powerful natures I have ever studied in my life." "The fact is," answered Johnson, "that he comes and goes in the open air without clothing himself more warmly than in the month of June." "Oh! the question of clothes is not of much consequence," replied the doctor; "it is of no use clothing people who do not produce heat naturally. It is the same as if we tried to warm a piece of ice by wrapping it up in a blanket! Hatteras does not want that; he is constituted so, and I should not be surprised if being by his side were as good as being beside a stove."