Anthony Boucher said this quote

“ Beer gurgled through the beard. 'You see,' the young man began, 'the desert's so big you can't be alone in it. Ever notice that? It's all empty and there's nothing in sight, but there's always something moving over there where you can't quite see it. It's something very dry and thin and brown, only when you look around it isn't there. Ever see it?''Optical fatigue -' Tallant began.'Sure. I know. Every man to his own legend. There isn't a tribe of Indians hasn't got some way of accounting for it. You've heard of the Watchers? And the twentieth-century white man comes along, and it's optical fatigue. Only in the nineteenth century things weren't quite the same, and there were the Carkers.''You've got a special localized legend?''Call it that. You glimpse things out of the corner of your mind, same like you glimpse lean, dry things out of the corner of your eye. You incase 'em in solid circumstance and they're not so bad. That is known as the Growth of Legend. The Folk Mind in Action. You take the Carkers and the things you don't quite see and put 'em together. And they bite.'Tallant wondered how long that beard had been absorbing beer. 'And what were the Carkers?' he prompted politely.'Ever hear of Sawney Bean? Scotland - reign of James the First or maybe the Sixth, though I think Roughead's wrong on that for once. Or let's be more modern - ever hear of the Benders? Kansas in the 1870's? No? Ever hear of Procrustes? Or Polyphemus? Or Fee-fi-fo-fum?'There are ogres, you know. They're no legend. They're fact, they are. The inn where nine guests left for every ten that arrived, the mountain cabin that sheltered travelers from the snow, sheltered them all winter till the melting spring uncovered their bones, the lonely stretches of road that so many passengers traveled halfway - you'll find 'em everywhere. All over Europe and pretty much in this country too before communications became what they are. Profitable business. And it wasn't just the profit. The Benders made money, sure; but that wasn't why they killed all their victims as carefully as a kosher butcher. Sawney Bean got so he didn't give a damn about the profit; he just needed to lay in more meat for the winter.'And think of the chances you'd have at an oasis.''So these Carkers of yours were, as you call them, ogres?''Carkers, ogres - maybe they were Benders. The Benders were never seen alive, you know, after the townspeople found those curiously butchered bodies. There's a rumor they got this far West. And the time checks pretty well. There wasn't any town here in the 80s. Just a couple of Indian families - last of a dying tribe living on at the oasis. They vanished after the Carkers moved in. That's not so surprising. The white race is a sort of super-ogre, anyway. Nobody worried about them. But they used to worry about why so many travelers never got across this stretch of desert. The travelers used to stop over at the Carkers, you see, and somehow they often never got any further. Their wagons'd be found maybe fifteen miles beyond in the desert. Sometimes they found the bones, too, parched and white. Gnawed-looking, they said sometimes.''And nobody ever did anything about these Carkers?''Oh, sure. We didn't have King James the Sixth - only I still think it was the First - to ride up on a great white horse for a gesture, but twice there were Army detachments came here and wiped them all out.''Twice? One wiping-out would do for most families.'Tallant smiled at the beery confusion of the young man's speech.'Uh-huh, That was no slip. They wiped out the Carkers twice because you see once didn't do any good. They wiped 'em out and still travelers vanished and still there were white gnawed bones. So they wiped 'em out again. After that they gave up, and people detoured the oasis.(They Bite) ”