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ACROSS
1)  either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood
2)  united states chemist who discovered deuterium (1893-1981)
3)  a large quantity of written matter
4)  informal terms for a meal


DOWN
1)  qualities that attract by seeming to promise some kind of reward
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  clean or organized
4)  athletic facility equipped for sports or physical training

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lung
urey
ream
eats