Each spring, as trees in the Northern Hemisphere put out leaves, the amount of oxygen starts to go up, then dips down again in the winter. Given the subtlety of the measurements and the great potential for contamination of samples, it often seems impossible that clear trends will show up, says post-doctoral researcher Melissa Hendricks. But after about six months, when you see the curves developing on the graph, it's really exciting. Sometimes when I'm running an experiment I can't wait to come to work in the morning and see what the results will be. Nassau notes The Bulletin is published weekly during the academic year, except during University breaks and exam weeks, by the Office of Communications, Princeton University, Princeton, NJ 08544.
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