This book presents a series of papers in the field of pathology which were written by students and associates of Peter MacCallum, pathologist, of Melbourne, Australia, on the occasion of his sixty-fifth birthday. The papers cover various aspects of morphologic pathology, but many of them are also of interest to the clinician and concern broad aspects of biology. Special reference should be made among the 23 papers to "The Contribution of Pathology to Biology" by King, "Metaplasia" by Willis, "Normal and Pathologic Patterns in the Liver" by Cameron, and "Vascularization and Hemorrhage in the Arterial Wall" by Wartman. The last two authors were associated with Peter MacCallum only a very short time, whereas most of the others have been his students. The papers, as well as the large number of excellent illustrations, make worthwhile reading and give information not necessarily available elsewhere.