Abstract
Edward P. Claus, Varro E. Tyler Jr., and Lynn R. Brady: PHARMACOGNOSY, 6th ed., Philadelphia: Lee and Febiger, 1970, XII + 518 pp., 213 Illustrations and 3 Plates in color, $ 17.50.
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Jacobus H. van t Hoff: Imagination in science. Transl. and introduction by G. F. Springer. Molecular Biology, Biochemistry, and Biophysics, vol. I: VI, 18 pp., 1 portr.; 1967. Springer-Verlag New York, Inc., 175 Fifth Ave., New York 10010.$ 1.65.