THIS BOOK WAS WRITTEN TO FUNCTION AS A STUDENT LABORATORY MANUAL OR AS TEACHER RESOURCE MATERIAL FOR DEVELOPING A LABORATORY-CENTERED COURSE IN PRACTICAL BIOLOGY FOR STUDENTS IN THE 13-16 AGE GROUP. IT WAS DESIGNED TO SUPPLY A COMPREHENSIVE SET OF EXPERIMENTS WHICH, WHEN CARRIED OUT IN CONJUNCTION WITH NORMAL THEORETICAL AND ANATOMICAL STUDIES, SHOULD GIVE A BASIC UNDERSTANDING OF THE FUNCTION OF BIOLOGICAL SYSTEMS AND ORGANS. EXTENSIVE USE IS MADE OF BIOCHEMICAL TESTS, LIVE MATERIAL PREPARATIONS, AND MODEL DEVELOPMENT IN THE FORMATION OF MAJOR BIOLOGICAL CONCEPTS. ALL THE EXPERIMENTS HAVE BEEN DESIGNED WITH COST IN MIND AND FEW SHOULD CAUSE FINANCIAL DIFFICULTY TO TEACHERS ON A LIMITED BUDGET. THIS DOCUMENT IS AVAILABLE FOR $2.95 FROM PERGAMON PRESS, 44-01 21ST STREET, LONG ISLAND CITY, NEW YORK 11101. (DS)