Twenty-One Laboratory Sessions in Microbiology is a well organized laboratory manual for the student and the instructor. The instructor can select any number of completed laboratory exercises and use them the to assign an objective grade for the student's completed laboratory work. It is an understandable introductory laboratory manual for the beginning microbiology student. It is clear, concise and easy to read. It is abbreviated, but also comprehensive. It provides basic information needed to reinforce information provided in any introductory microbiology textbook. The manual will clarify lecture information presented in class. Twenty-One Laboratory Sessions in Microbiology contains instructional exercises that are present in most microbiology laboratory manuals. However, most manuals present many more exercises than can be completed in one semester. Most of the work in this book can be completed in a ten-week course. After completing the exercises in this manual, the student will learn: . what science is . the scientific method . how and why we study microbiology . the major topics presented in a microbiology course. Another purpose of this manual is to fill in "gaps" in the knowledge base of students who have been out of school for some time. Helpful study "tips" are included too. The author actively engages the student in the learning process through relevant activities. Simple activities are built upon to in order understand complex activities."