They have a sticky wet sort of inside, which doesn't quench your thirst any, but helps to keep you from drying up and blowing away.
All that day we plugged along as per usual.

It was main hard work, and we got to that state where things are disagreeable, but mechanical.
Strange to say, Schwartz kept in the lead.

It seemed to me at the time that he was using more energy than the occasion called for--just as man runs faster before he comes to the giving-out point.

However, the hours went by, and he didn't seem to get any more tired than the rest of us.
We kept a sharp lookout for anything to eat, but there was nothing but lizards and horned toads.

Later we'd have been glad of them, but by that time we'd got out of their district.