Walker's "Introduction to Dermatology" appeared first in 1899. It was an outgrowth of his Edinburgh lectures to students, and was frankly offered as an orientation of the complex field of dermatology. From the time of its appearance it has been recognized as an excellent book—one that gave a careful statement of dermatology, but at the same time bore a distinct impress of the author's personality. It was and is a personal book—and a personal book that reflects credit on the author. In twelve years five editions have been called for, and that is a good evidence of the estimate in which the work is held. The succeeding editions have varied chiefly by additions to the contents. This edition takes note of recent additions to dermatologic knowledge but otherwise shows few variations from the fourth.