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ACROSS
1)  scottish chemist noted for his research into the structure of nucleic acids (born in 1907)
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)  the part of the leg of a human being below the ankle joint
4)  commonly the lowest molding at the base of a column


DOWN
1)  a bunch of hair or feathers or growing grass
2)  chocolate cookie with white cream filling
3)  distinguished from bovidae by the male's having solid deciduous antlers
4)  the specified day of the month

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