ZAMBEZIAThe Journal of theUniversity of ZimbabweVolume 16, No. i, 1989IŠ4.ZAMBEZIAThe Journal of the University of ZimbabweEditor: Professor R. S. Roberts ISSN 0379-0622CONTENTS Volume 16, No. i, 1989Gully Form and Development on Karoo Sediments inCentral Zimbabwe: A PreliminarySurvey R. Whitlow and C. FirthMedicines and Symbols M. F. C. BourdillonA Participatory Model of Agricultural Research and Extension:The Case of Vleis, Trees and Grazing Schemes in theDry South of Zimbabwe /. Scoones and B. CousinsRESEARCH REPORTNutritive Value of Foods of Zimbabwe Irene C. ChitsikuBOOK REVIEWS® University of Zimbabwe, 1990Published by University of Zimbabwe Publications,P.O. Box MP 45, Mount Pleasant, Harare, ZimbabwePhototypeset at the University of ZimbabwePrinted by City Printers, HarareZAMBEZIAThe publication of Zambezia, the bi-annual journal of the University ofZimbabwe, has been made possible by the generous support of the PublicationsCommittee of the University. The main focus of the journal, as its nameimplies, is South Central Africa; but inaugural lectures and special articles of amore general interest are also published. Monograph supplements toZambezia, of which there may be up to ten in a year, cover the main disciplinesin the University (Agriculture, Commerce, Education, Engineering, theHumanities, Law, Medicine, Science, Social Studies, Veterinary Science), anddo not necessarily have the same regional focus as Zambezia itself.ORDERS A complete catalogue of these publications may be obtained freeof charge on application to the Publications Officer, University of Zimbabwe,P.O. Box MP 45, Mount Pleasant, Harare, Zimbabwe. Standing orders for theJournal and/or supplements, under which an invoice is sent prior to dispatch ofthe order, are welcomed.