Encyclopaedia of Plant Physiology, New Series : edited by A. Pirson and M. H. Zimmermann, Volume 13A, Plant Carbohydrates I, Intracellular Carbohydrates, edited by F.A. Loewus and W. Tanner, 1982, xx + 793 pages + Author and Subject Indices, 124 pages, $132.40; and Volume 13B, Plant Carbohydrates II, Extracellular Carbohydrates, edited by W. Tanner Loewus, Spring-Verlag, Berlin-Heidelberg-New York, 1981, xxii + 677 pages + Author, Species and Subject Indices, 91 pages, $114.10