It is not to keep out the ether that we have gone to such trouble. It is to keep in the oxygen. I trust that if we can ensure an atmosphere hyper-oxygenated to a certain point, we may be able to retain our senses. I had two tubes of the gas and you have brought me three more. It is not much, but it is something."
"How long will they last?"
"I have not an idea. We will not turn them on until our symptoms become unbearable. Then we shall dole the gas out as it is urgently needed. It may give us some hours, possibly even some days, on which we may look out upon a blasted world. Our own fate is delayed to that extent, and we will have the very singular experience, we five, of being, in all probability, the absolute rearguard of the human race upon its march into the unknown. Perhaps you will be kind enough now to give me a hand with the cylinders. It seems to me that the atmosphere already grows somewhat more oppressive."
