This incident seemed to have terminated the discussion, but when the agitation had subsided these words were heard uttered in a loud and severe voice:-- "Now that the orator has allowed his fancy to roam, perhaps he would kindly go back to his subject, pay less attention to theories, and discuss the practical part of his expedition." All eyes were turned towards the person who spoke thus. He was a thin, dry-looking man, with an energetic face and an American beard. By taking advantage of the agitation in the assembly from time to time he had gained, by degrees, the front row of spectators. There, with his arms crossed, his eyes brilliant and bold, he stared imperturbably at the hero of the meeting. After having asked his question he kept silence, and did not seem disturbed by the thousands of eyes directed towards him nor by the disapproving murmur excited by his words. The answer being delayed he again put the question with the same clear and precise accent; then he added-- "We are here to discuss the moon, not the earth." "You are right, sir," answered Michel Ardan, "the discussion has wandered from the point; we will return to the moon." "Sir," resumed the unknown man, "you pretend that our satellite is inhabited. So far so good; but if Selenites do exist they certainly live without breathing, for--I tell you the fact for your good--there is not the least particle of air on the surface of the moon." At this affirmation Ardan shook his red mane; he understood that a struggle was coming with this man on the real question. He looked at him fixedly in his turn, and said-- "Ah! there is no air in the moon! And who says so, pray?" "The _savants_." "Indeed?" "Indeed." "Sir," resumed Michel, "joking apart, I have a profound respect for _savants_ who know, but a profound contempt for _savants_ who do not know." "Do you know any who belong to the latter category?" "Yes; in France there is one who maintains that, 'mathematically,' a bird cannot fly, and another who demonstrates that a fish is not made to live in water." "There is no question of those two, sir, and I can quote in support of my proposition names that you will not object to." "Then, sir, you would greatly embarrass a poor ignorant man like me!" "Then why do you meddle with scientific questions which you have never studied?" asked the unknown brutally. "Why?" answered Ardan; "because the man who does not suspect danger is always brave! I know nothing, it is true, but it is precisely my weakness that makes my strength." "Your weakness goes as far as madness," exclaimed the unknown in a bad-tempered tone. "So much the better," replied the Frenchman, "if my madness takes me to the moon!"