"Once in a while," replied Dr. Bird dryly, "I think enough to know the futility of guesses hazarded without complete data. We are now located within the limits of the amnesia belt and we are here to find out what did happen, if anything, and not to make wild guesses about it. You have the tent set up for us, Major?"
"Yes, Doctor, about thirty yards from the cabin and hidden so well that you could pass it a dozen times a day without suspecting its existence. The gas masks and other equipment which you sent to Fort Banks are in it."
"In that case we had better dispense with your company as soon as we have eaten a bite, and retire to it. On second thought, we will eat in it. Carnes, we will go to our downy couches at once and leave our substitutes in possession of the cabin. I trust, gentlemen, that things come out all right and that you are in no danger."
Major Trowbridge shrugged his heavy shoulders.
"It is as the gods will," he said sententiously. "It is merely a matter of duty to me, you know, and thank God, I have no family to mourn if anything does go wrong. Neither has Corporal Askins."
"Well, good luck at any rate. Will you guide Carnes to the tent and then return here and I'll join him?"
uddled in the tiny concealed tent, Dr. Bird handed Carnes a haversack on a web strap.
"This is a gas mask," he said. "Put it on your neck and keep it ready for instant use. I have one on and one of us must wear a mask continually while we are here. We'll change off every hour. If the gas used is lethane, as I suspect, we should be able to detect it before its gets too concentrated, but some other gas might be used and we must take no chances. Now look here."