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Cover Illustration: A light micrograph of a transverse section of fossil Metasequoia wood collected from Axel Heiberg Island, Nunavut, Canadian High Arctic, at 80°N latitude. This tree grew approximately 45 million years ago in what is believed to have been a warm temperate swamp. Except for some cell distortion due to loss of cellulose and burial under sediments, the excellent preservation reveals the same uniform wood structure found in extant M. glyptostroboides-a wood structure particularly well-adapted for tall conifers growing in uniformly moist areas. See Jagels and Visscher: A synchronous increase in hydraulic conductive capacity and mechanical support in conifers with relatively uniform xylem structure, pp. 179-187. Photo credit: George A. Visscher.
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