INTRODUCTION 3 



Schafer for valuable and ready help at aU stages in the prepara- 

 tion of this volume. Professor Schafer has kindly looked through 

 the manuscript of the chapter on " The Testicle and Ovary as 

 Organs of Internal Secretion," besides giving helpful advice 

 and criticism on various points connected with publication. 

 Indeed,, it is not too much to say that had it not been for him, 

 the book would scarcely have been written. Dr. H. K. Anderson 

 and Professor Sutherland Simpson have read the manuscript 

 or proofs of the chapter dealing with " The Accessory Male 

 Organs." Mr. E. S. Carmichael, of the Royal Infirmary, Edin- 

 burgh, has read the section deahng with parturition. Dr. J. H. 

 Ashworth has looked through the chapter on " FertiUsation " ; 

 and Dr. F. G. Hopkins has done the same for Dr. Cramer's 

 biochemical chapter. Dr. Anderson and Dr. Ashworth have 

 also given me the benefit of their special knowledge in other 

 parts of the work. To all these I am under obligations. I 

 wish also to tender my thanks to those authors and publishers 

 who have kindly allowed me to reproduce illustrations from their 

 respective worlfs, as well as to record my indebtedness to the 

 following, who have been of service by giving me information, 

 important references, or assistance in other ways : — Dr. Nelson 

 Annandale, Superintendent of the Indian Museum, Calcutta, 

 Dr. W. Blair Bell, of Liverpool, Mr. Eagle Clarke, Super- 

 intendent of the Scottish National Museum, Professor J. C. 

 Ewart, of the University of Edinburgh, Professor J. P. Hill, of 

 University College, London, Dr. A. C. Haddon, of Christ's 

 College, Dr. W. A. Jolly, of the University of Edinburgh, 

 Dr. Janet E. Lane-Claypon, of London, Mr. D. G. LiUie, of St. 

 John's College, Mr. K. J. J. Mackenzie, of Christ's College, Mr. 

 F. A. Potts, of Trinity Hall, Dr. C. G. Seligmann, of London, 

 and Mr. A. E. Shipley, of Christ's College. Lastly, I wish to 

 acknowledge the assistance of Mr. C. H. Crawshaw, of Christ's 

 College, in the correction of the proofs, as well as to express 

 my obligations to Mrs. Hingston Quiggin for the willing labour 

 she has expended in preparing the index and finally revising 

 the text, and to Mr. Richard Muir for the skilful manner in 

 which he has executed those drawings which are new. 



