THE PHYSIOLOGY OF 

 REPRODUCTION 



FRANCIS H. A. MARSHALL 



M.A. (Cantab.), D.Sc. (Edin.) 



FELLOW OF OHBIST'S OOLLEQE, CAMBRIDGE, AND UNIVERSITY LECTURER 

 IN AGRICULTURAL PHYSIOLOGY 



WITH A PREFACE BY 

 Professor E. A. SCHAFER, Sc.D., LL.D., F.R.S. 



AND CONTRIBUTIONS BY 

 WILLIAM CRAMER, Ph.D., D.Sc. 



AND 



JAMES LOCHHEAD, M.A., M.D., B.Sc, F.R.C.S.E. 



WITH ILLUSTRATIONS 



LONGMANS, GREEN AND CO. 



39 PATERNOSTER ROW, LONDON 



NEW YORK, BOMBAY, AND CALCUTrA 



1910 



All rights reserved 



