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By National Academy of Sciences, Office of the Home Secretary

Biographical Memoirs is a chain of essays containing the lifestyles histories and chosen bibliographies of deceased individuals of the nationwide Academy of Sciences. The sequence presents a list of the existence and paintings of a few of the main distinctive leaders within the sciences, as witnessed and interpreted through their colleagues and friends. They shape a biographical heritage of technology in America--an vital a part of our nation's contribution to the highbrow history of the realm.

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It has been shown that nutrients of this type, if applied in the spring, are not taken up until the water in which they reside is taken up by the roots and transpired by the plant leaves. The water that is pulled up through the soil by transpiration is replaced by water farther away from the roots. Nutrients close to the roots move by mass-flow with the water to the root surfaces. When nutrients, such as calcium and magnesium, are abundant in the soil solution they may often move faster than the plant can take them up, and they actually pile up in the soil surrounding the roots.

J. B. Peterson, also a well-known soil physicist and chemist, who had left Iowa State University to become department head at Purdue. From the most humble of beginnings Barber rose to become one of the best known and respected soil scientists in the world. At Purdue, Barber was given wide latitude in the choice of specialty to follow. With his strong background in physics and chemistry he elected to study the uptake of nutrients by plants. Until this time, plant nutrition had been studied in nutrient solutions and through field trials that were analyzed statistically.

Linn. Soc. Lond. 61:37-64. 1970 With C. A. Arnold, E. Boureau, J. Doubinger, and S. Leclercq. Filicophyta. In Traité de Paleobotanique, vol. 4, fasc. 1, ed. E. Boureau, pp. 17-406. Paris: Masson et Cie. Index of Generic Names of Fossil Plants, 1820-1965. S. Geological Survey Bulletin No. 1300. S. Geological Survey. Copyright © National Academy of Sciences. All rights reserved. html BIOGRAPHICAL MEMOIRS 1972 With T. L. Phillips and P. G. Gensel. Two heterosporous species of Archaeopteris from the Upper Devonian of West Virginia.

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