zoology and to accompany a zoology textbook. Various exercises cover most of the zoological disciplines such as cytology, morphology, anatomy, taxonomy, physiology, and ecology. The workbook includes the traditional general zoology laboratory exercises. Unit I introduces the student to the microscope, molecular models, cytology, histology, and cell division. The microscope is the most important instrument used in a biology laboratory and is presented in the first exercise. Typical cells and tissues are then studied. Unit II deals with vertebrate animals. Our surveys show that the frog is the animal most used as a typical vertebrate representative; consequently, a major portion of this unit is devoted to a study of the anatomy and physiology of the frog with references to human structure and function. A study of gametogenesis and embryology is included in Unit III. Unit IV includes classification of invertebrate animals and important structural characteristics of each phylum. Several typical representatives of each phylum, from the simple to the complex, will be studied with an emphasis on the levels of organization. Live specimens will be used whenever possible. Also, this unit consists of an exercise on a cephalochordate, Branchiostomata (Amphioxus). Chordate characteristics will be reviewed along with general anatomy of this animal. There are several photographs and drawings of animals and/or their structures; however, students will be called upon to draw different cells, tissues, or other material. Drawing is one of the oldest methods of recording things observed. It is through observation that one can tell what the other is seeing and to what extent. The workbook is written in most places so that the student may proceed with the laboratory work with little preliminary discussion or direction by the instructor. The student will find it possible to get most of the facts with the aid of given directions, charts, textbook, and other visible means. Thus, the instructor is available to aid those students having difficulty and to explain facts beyond the simple observations possible in the laboratory.

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