"The oxygen!" he cried, and, suddenly stooping down and examining the
tap of the air apparatus, he saw that it had been only half turned off.
Consequently the air was gradually getting more and more impregnated
with this powerful gas, colorless, odorless, tasteless, infinitely
precious, but, unless when strongly diluted with nitrogen, capable of
producing fatal disorders in the human system. Ardan, startled by
M'Nicholl's question about the means of returning from the Moon, had
turned the cock only half off.
The Captain instantly stopped the escape of the oxygen, but not one
moment too soon. It had completely saturated the atmosphere. A few
minutes more and it would have killed the travellers, not like carbonic
acid, by smothering them, but by burning them up, as a strong draught
burns up the coals in a stove.
[Illustration: "THE OXYGEN!" HE CRIED.]
It took nearly an hour for the air to become pure enough to allow the
lungs their natural play. Slowly and by degrees, the travellers
recovered from their intoxication; they had actually to sleep off the
fumes of the oxygen as a drunkard has to sleep off the effects of his
brandy. When Ardan learned that he was responsible for the whole
trouble, do you think the information disconcerted him? Not a bit of it.
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