=William Wathen, M. D.=, _Professor of Obstetrics, Abdominal Surgery, and Gynecology, and Dean, Kentucky School of Medicine, Louisville, Ky._ “It is systematic, scientific, full of simplicity, and just such a work as a medical student will be able to comprehend.” Birmingham Medical Review, England “We can most confidently recommend Dr. Heisler’s book to the student of biology or medicine for his careful study, if his aim be to acquire a sound and practical acquaintance with the subject of embryology.” Mallory _and_ Wright’s Pathologic Technique Just Issued--Fourth Edition, Revised and Enlarged =Pathologic Technique.= A Practical Manual for Workers in Pathologic Histology, including Directions for the Performance of Autopsies and for Clinical Diagnosis by Laboratory Methods. By FRANK B. MALLORY, M. D., Associate Professor of Pathology, Harvard University; and JAMES H. WRIGHT, M. D., Director of the Clinico-Pathologic Laboratories, Massachusetts General Hospital. Octavo of 500 pages, with 155 illustrations. Cloth, $3.00 net. WITH CHAPTERS ON POST-MORTEM TECHNIQUE AND AUTOPSIES In revising the book for the new edition the authors have kept in view the needs of the laboratory worker, whether student, practitioner, or pathologist, for a practical manual of histologic and bacteriologic methods in the study of pathologic material. Many parts have been rewritten, many new methods have been added, and the number of illustrations has been considerably increased. Among the many changes and additions may be mentioned the amplification of the description of the Parasite of Actinomycosis and the insertion of descriptions of the Bacillus of Bubonic Plague, of the Parasite of Mycetoma, and Wright’s methods for the cultivation of Anaërobic Bacteria. There have also been added new staining methods for elastic tissue by Weigert, for bone by Schmorl, and for connective tissue by Mallory. The new edition of this valuable work keeps pace with the great advances made in pathology, and will continue to be a most useful laboratory and post-mortem guide, full of practical information. PERSONAL AND PRESS OPINIONS =Wm. H. Welch, M. D.=, _Professor of Pathology, Johns Hopkins University, Baltimore_. “I have been looking forward to the publication of this book, and I am glad to say that I find it a most useful laboratory and post-mortem guide, full of practical information and well up to date.” Boston Medical and Surgical Journal “This manual, since its first appearance, has been recognized as the standard guide in pathological technique, and has become well-nigh indispensable to the laboratory worker.” Journal of the American Medical Association