Lester Del Rey,
The Sky Is Falling
“ For a moment, the thickness seemed to relax, and Hanson choked a few words out through it. "What's the world of a mandrake-man, Sather Karf? A mandrake swamp?""For a mandrake-man, yes. But not for you." There was something like amusement in the old man's voice. "I never said you were a mandrake-man. That was told you by Ser Perth who knew no better. No, Dave Hanson, you were too important to us for that. Mandrake-men are always less than true men, and we needed your best. You were conjured atom by atom, id and ka and soul, from your world. ”
