Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
About the Cover


Cross section of pin oak wood (about X 5.5). A column of water supported only by atmospheric presurre can be only 10.3 meters high. Since trees grow higher than this, the acent of sap in the xylem must be due to another machanism. Tension has been assumed to be the machanism, but a new theory is proposed. See page 1129. [From patterns of life: The Unseen World of plants; copy-right © 1966 by William M. Harlow; reproduced by permission of Harper & Row]


[Table of Contents]

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)