PREFACE TO THE SECOND EDITION. 



The searching criticism, which the first edition of this outline received, 

 has enabled me to make the few corrections necessary to make it a reliable 

 book of reference as well as a useful text. I have inserted a little additional 

 matter, which is for the most part explanatory of points too briefly treated 

 in the first edition. I had expected to add a chapter on " Conduction 

 Paths ", but such an addition still seems inadvisable not only on account of 

 the highly theoretical nature of available material on this subject, but also 

 because the outline, in its present form, has had so large a measure of 

 success as a text-book that I hesitate to make any important change in it at 

 present. Different teachers will prefer to treat the brain-path hypotheses 

 in different ways, and it seems most economical to attempt in this text to 

 supply the essential basis for such treatment, but not to introduce any 

 specific schemes. 



In response to the suggestion which has been made by many students, I 

 have added a glossary, in which are given the derivations, as well as the 

 pronunciations, of a number of terms which are new to most of the begin- 

 ners. In cases where certain mispronunciations have become widespread in 

 America, these are noted for the student's information. 



The appreciation which the book has received, from biologists as well as 

 from psychologists, has been most gratifying, and makes it evident that 

 it may be recommended unhesitatingly as a reference book for biology 

 students. The objections from psychologists and psychiatrists who adhere 

 to the phrenological conception of brain function were fully expected. 



In the preparation of the manuscript of this edition, and in the reading 

 of the proof, I have received much appreciated assistance from Mr. English 

 Bagby. K. D. 



The Johns Hopkins University, November 8, 1916. 



