viii PREFACE 



present itself. The want of proper literary sequence 

 might indicate equally well that the subject had been 

 but insufficiently thought over, that the sequence of 

 ideas had been ill considered, and the conclusions hastily 

 arrived at. That in this case the matter is not so can 

 best be urged by stating that the substance of these 

 Lectures had been collected in the form of written notes 

 some seven years ago. Moreover, many of the details 

 and the ideas included in these pages I have been accus- 

 tomed to incorporate in the ordinary routine teaching 

 of Medical Students at Manchester University, at St. 

 Thomas's Hospital, and at the London School of Medicine 

 for Women . 



I have endeavoured to acknowledge my indebtedness 

 to the work of others wherever such a debt has been 

 incurred. Some debts, however, cannot be considered as 

 discharged by the mere acknowledgment of the source 

 of a quoted passage; to Professor Arthur Keith, and 

 to Professor G. Elliot Smith, I owe far more than is 

 implied in the few references made directly to their written 

 works. 



The figures which are reproduced here are selected from 

 those drawn to illustrate the Lectures; they were pre- 

 pared with especial regard for their appearance when 

 magnified by the epidiascope rather than when reduced 

 by the processes of reproduction. 



F. W. J. 



LONDON, 



October, 1916. 



