《Retrograde Evolution 》作者：- Clifford D Simak【EPUB】

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RETROGRADE EVOLUTION CLIFFORD D. SIMAK THE trader had saved some space in the cargo hold for the babu root which ounce for ounce represented a better profit than all the other stuff he carried from the dozen planets the ship had visited. But something had happened to the Google villages on the plant Zan. There was no babu root waiting for the ship and the trader had raged up and down calling forth upon all Googles dire maledictions combed from a score of languages and cultures. High in his cubbyhole one level down from the control room and the captains quarters Steve Sheldon the space ships assigned co-ordinator went through reel after reel of records pertaining to the planet and studied once again the bible of his trade Dennisons Key to Seitient Races. He searched for a hidden clue clawing through his close-packed memory for some forgotten fact which might apply. But the records were very little help. Zan one of the planets by-passed on the first wave of