Book excerpt: The Teacher s manual contains information designed to facilitate use of this kit by instructors and teaching assistants who may not be familiar with a particular plant-pathogen system. Included are additional back-ground information for instructors, sources of materials, list of materials needed, step-wise preparation, procedures, suggested schedules for conducting the exercises (including time required), a discussion of expected results, answer to questions and additional references. The listing of sources of material provided in case material is not available from a local source or regular supplier.