Dr. Boyd's justly popular treatise appears now in a new edition. Chapter 1, a brief philosophic discussion of the content of pathology, sets the stage, and the book then proceeds along conventional lines, dealing first with such general matters as degeneration, inflammation and tumors, and going on to the special diseases and organs. The writer's style is simple and lucid; to the reviewer the real difficulty is that the subject has outgrown the bounds of any one reasonable volume. Just as a random example, the "pathology" of thiamine is dealt with in a single paragraph of some dozen lines. However, if the student knows all that Dr. Boyd has to tell him in this compressed treatise, he will be doing well enough.