This is a book about microorganisms: viruses, bacteria, fungi, protozoans, and multicellular parasites. It is a text on microbiology, and covers basic microbiology, medical microbiology, and some industrial microbiology. It is an unusual text because it offers the student an opportunity to learn by coloring illustrations in a planned and meaningful sequence. The coloring approach opens the subject of microorganisms to high school students, yet college and graduate students will also find the content of this text challenging. A great deal of information can be gained from studying and working properly designed illustrations. "A picture is worth a thousand words." The student who colors the plates of this book will find real satisfaction in understanding the subject matter because it can be visualized. When recall of the material is required, the picture, complete with thoughtfully applied colors, quickly comes to mind. This book is a very important way to learn about a broad spectrum of microorganisms and how they interact with humans. Happy Coloring!