Vlll PREFACE 



(Oclontological Section), the Macmillan Co., the London Electro- 

 type Agency, Mr Heinemann, and the Editor of L Illustration 

 (Paris). Illustrations have also been borrowed from the publi- 

 cations of Professors Brodmann and Kramberger. Thus I have 

 endeavoured to make full acknowledgement of the various sources 

 of such illustrations as were not prepared in the form of sketches 

 made by myself from dissections or skeletons. 



W. L. H. D. 



Cambridge 



August 14, 1915 



