This book appeared first two years ago. It is now revised and expanded to include recent advances in knowledge in various fields of pathology. Silicosis, cancer of the lung, monocytic leukemia, the suprarenal in Addison's disease, the pituitary, and the structural changes in deficiency diseases are cited as examples of topics that have received special attention in this edition. There are seventeen chapters in all. The book contains helpful summaries of the current advances in pathology.