PREFACE TO THE FIRST EDITION 



This outline is intended to aid those students of psychology who have 

 had no courses in biology covering the morphological and physiological 

 data which are directly contributory to psychology. It is designed to con- 

 vey the elementary information which is absolutely necessary, and to stimu- 

 late the student to further reading. Since the time which a psychologist 

 can give to the study of biology is narrowly limited, it is essential that 

 strong emphasis should be placed on such details as are of the greatest 

 psychological significance, although this results in a treatment which, from 

 the physiological point of view, is extremely unbalanced. 



Heretofore, psychologists who have recognized the value of physiology 

 have confined their attention almost exclusively to neurology. This neur- 

 ology has been of little use to the psychologist, except as a terminological 

 scheme in which he could restate his psychological facts and speculations. 

 Of late it has been becoming clear that the pressing need in psycho-physi- 

 ology is for the study of muscle and gland, and that only through the 

 study of these tissues in their structural and functional relation to nervous 

 tissue can neurology be made psychologically valuable. It is this point of 

 view which has dominated the preparation of this outline. 



I hope that this book, which was prepared primarily for the use of my 

 own classes, may be of service to other psychologists, at least until a more 

 systematic and comprehensive text becomes available. Since it is, at the 

 time of writing, the first book of its kind, it is entitled to the credit, and 

 also to the leniency usually extended to pioneers. 



The cuts which accompany the text are from various sources. Some are 

 familiar from having appeared in many places. I am much indebted to 

 those who have kindly given me permission to use or reproduce their illus- 

 trations, especially to Dr. Ramon y Cajal, and to the authors, editors, 

 and publishers of Bailey's Histology and Cunningham's Anatomy (William 

 Wood and Co., New York) ; Lewis and Stohr's Histology (P. Blakis- 

 ton's Son & Co., Philadelphia) ; Quain's Anatomy (Eleventh Edition, 

 Longmans, Green and Co., New York) ; Barker's The Nervous System 

 (D. Appleton & Co., New York) ; and Toldt's Atlas of Human Anatomy 

 (Rebman and Co., New York). 



The lists of references appended to each chapter is merely typical. 

 There are many books in which the student may find helpful material by 



