“I should say that its working does not require a large crew.” “Certainly, under existing conditions, ten men, at the most, ought to be enough.” “Well, why should there be any more?” “Why?” I replied, looking fixedly at Ned Land, whose meaning was easy to guess. “Because,” I added, “if my surmises are correct, and if I have well understood the Captain’s existence, the _Nautilus_ is not only a vessel: it is also a place of refuge for those who, like its commander, have broken every tie upon earth.” “Perhaps so,” said Conseil; “but, in any case, the _Nautilus_ can only contain a certain number of men. Could not you, sir, estimate their maximum?” “How, Conseil?” “By calculation; given the size of the vessel, which you know, sir, and consequently the quantity of air it contains, knowing also how much each man expends at a breath, and comparing these results with the fact that the _Nautilus_ is obliged to go to the surface every twenty-four hours.” Conseil had not finished the sentence before I saw what he was driving at. “I understand,” said I; “but that calculation, though simple enough, can give but a very uncertain result.” “Never mind,” said Ned Land urgently. “Here it is, then,” said I. “In one hour each man consumes the oxygen contained in twenty gallons of air; and in twenty-four, that contained in 480 gallons. We must, therefore find how many times 480 gallons of air the _Nautilus_ contains.” “Just so,” said Conseil. “Or,” I continued, “the size of the _Nautilus_ being 1,500 tons; and one ton holding 200 gallons, it contains 300,000 gallons of air, which, divided by 480, gives a quotient of 625. Which means to say, strictly speaking, that the air contained in the _Nautilus_ would suffice for 625 men for twenty-four hours.” “Six hundred and twenty-five!” repeated Ned. “But remember that all of us, passengers, sailors, and officers included, would not form a tenth part of that number.” “Still too many for three men,” murmured Conseil. The Canadian shook his head, passed his hand across his forehead, and left the room without answering. “Will you allow me to make one observation, sir?” said Conseil. “Poor Ned is longing for everything that he can not have. His past life is always present to him; everything that we are forbidden he regrets. His head is full of old recollections. And we must understand him. What has he to do here? Nothing; he is not learned like you, sir; and has not the same taste for the beauties of the sea that we have. He would risk everything to be able to go once more into a tavern in his own country.”