A Manual of the Sub-Kingdom Protozoa: With a General Introduction on the Principles of Zoology (1863) is a comprehensive guide to the study of protozoa, a sub-kingdom of single-celled organisms. Written by Joseph Reay Greene, this book provides a detailed overview of the classification, morphology, and physiology of protozoa, as well as their ecological and evolutionary significance. The book is divided into several sections, each of which covers a different aspect of protozoan biology, including their structure, reproduction, behavior, and distribution. Additionally, the book includes a general introduction to the principles of zoology, providing readers with a foundation for understanding the study of animal life. With its detailed descriptions and thorough analysis, A Manual of the Sub-Kingdom Protozoa is an invaluable resource for students and researchers in the field of biology.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.