Produced by Bryan Ness, Josephine Paolucci and the Online Distributed Proofreading Team at https://www.pgdp.net. (This book was produced from scanned images of public domain material from the Google Print project.) HISTOLOGY OF THE BLOOD NORMAL AND PATHOLOGICAL. London: C. J. CLAY AND SONS, CAMBRIDGE UNIVERSITY PRESS WAREHOUSE, AVE MARIA LANE, AND H. K. LEWIS, 136, GOWER STREET, W.C. Glasgow: 50, WELLINGTON STREET. Leipzig: F. A. BROCKHAUS. New York: THE MACMILLAN COMPANY. Bombay: E. SEYMOUR HALE. Transcriber's note: For Text: Words surrounded by a cedilla such as ~this~ signifies that the words are bolded in the text. Words surrounded by underscores like _this_ signifies the words are in italics in the text. Words surrounded by equal signs (=like this=) means the letters in the words are spaced out (gesperrt). For numbers and equations, carats before bracketed numbers denote a superscript. Minor typos have been corrected. HISTOLOGY OF THE BLOOD NORMAL AND PATHOLOGICAL BY P. EHRLICH AND A. LAZARUS. EDITED AND TRANSLATED BY W. MYERS, M.A., M.B., B.Sc. JOHN LUCAS WALKER STUDENT OF PATHOLOGY. WITH A PREFACE BY G. SIMS WOODHEAD, M.D. PROFESSOR OF PATHOLOGY IN THE UNIVERSITY OF CAMBRIDGE. CAMBRIDGE: AT THE UNIVERSITY PRESS. 1900 [_All Rights reserved._] Cambridge: PRINTED BY J. AND C. F. CLAY, AT THE UNIVERSITY PRESS. PREFACE. In no department of Pathology has advance been so fitful and interrupted as in that dealing with blood changes in various forms of disease, though none now offers a field that promises such an abundant return for an equal expenditure of time and labour. Observations of great importance were early made by Wharton Jones, Waller, and Hughes Bennett in this country, and by Virchow and Max Schultze in Germany. Not, however, until the decade ending in 1890 was it realised what a large amount of new work on the corpuscular elements of the blood had been done by Hayem, and by Ehrlich and his pupils. As successive papers were published, especially from German laboratories, it became evident that the systematic study of the blood by various new methods was resulting in the acquisition of a large number of facts bearing on the pathology of the blood; though it was still difficult to localise many of the normal haematogenetic processes. The production of the various cells under pathological conditions, where so many new factors are introduced, must necessarily be enshrouded in even greater obscurity and could only be accurately determined by patient investigation, a careful arrangement and study of facts, and cautious deduction from accumulated and classified observations.