The previous edition was published eight years ago. Since that time numerous advances have been made, which the author has incorporated in this edition. The text has been thoroughly revised and a few new colored plates have been added. The same general plan has been followed in the text. The chapter on anemias, leukemias, hemorrhagic diseases and hypoplastic and aplastic states of the blood-forming organs have been completely revised. The former editions of this book were well received and the present edition should enjoy the same popularity.