"My good Summerlee, this etheric poison is most certainly influenced by material agents. We see it in the methods and distribution of the outbreak. We should not _a priori_ have expected it, but it is undoubtedly a fact. Hence I am strongly of opinion that a gas like oxygen, which increases the vitality and the resisting power of the body, would be extremely likely to delay the action of what you have so happily named the daturon. It may be that I am mistaken, but I have every confidence in the correctness of my reasoning." "Well," said Lord John, "if we've got to sit suckin' at those tubes like so many babies with their bottles, I'm not takin' any." "There will be no need for that," Challenger answered. "We have made arrangements--it is to my wife that you chiefly owe it--that her boudoir shall be made as airtight as is practicable. With matting and varnished paper." "Good heavens, Challenger, you don't suppose you can keep out ether with varnished paper?" "Really, my worthy friend, you are a trifle perverse in missing the point. 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 rear guard 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." Chapter III SUBMERGED The chamber which was destined to be the scene of our unforgettable experience was a charmingly feminine sitting-room, some fourteen or sixteen feet square. At the end of it, divided by a curtain of red velvet, was a small apartment which formed the Professor's dressing-room. This in turn opened into a large bedroom. The curtain was still hanging, but the boudoir and dressing-room could be taken as one chamber for the purposes of our experiment. One door and the window frame had been plastered round with varnished paper so as to be practically sealed. Above the other door, which opened on to the landing, there hung a fanlight which could be drawn by a cord when some ventilation became absolutely necessary. A large shrub in a tub stood in each corner.