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The Scientist has asked a group of experts to periodically comment upon recent articles that they have found noteworthy. Their selections, presented here in every issue, are neither endorsements of content nor the result of systematic searching. Rather, they are personal choices of articles they believe the scientific community as a whole may also find interesting. Reprint. of any artieles cited here may be ordered through The Genuine Article, 5501 Market St., Philadelphia, Pa. 19104, or by tel

The Scientist Staff
The Scientist has asked a group of experts to periodically comment upon recent articles that they have found noteworthy. Their selections, presented here in every issue, are neither endorsements of content nor the result of systematic searching. Rather, they are personal choices of articles they believe the scientific community as a whole may also find interesting. Reprint. of any artieles cited here may be ordered through The Genuine Article, 5501 Market St., Philadelphia, Pa. 19104, or by telephoning (215)886-4899.

BY PETER D. MOORE
Department of Biology
King’. College

" The fact that C4 plants are richer in 13C than C3 plants can be used to study pest diets of animals by analyzing their bones or shells. Fossil snails, dating from about 3,000 to 4,000 years ago in the northern Negev Israel, provide evidence for a more southerly distribution of C3 plants at that time, implying moister conditions.

G.A. Goodfriend,...

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