PREFATORY NOTE 



THE general organization of the Handbook has been retained in 

 the present revision, but the anatomical discussions have been very 

 greatly reduced. The text has been largely rewritten throughout, and 

 many new illustrations of physiological experiments have been intro- 

 duced. An entirely new feature is the introduction, at the end of the 

 chapters, of directions for laboratory work. It is hoped that this will 

 greatly increase the utility of the book both to the teacher and to the 

 student. Acknowledgment is given my colleagues, Dr. C. M. Jack- 

 son for reading the manuscript on the Nervous System, and Miss 

 Caroline McGill for similar criticism of the chapter on the Elementary 



Structure of the Tissues. 



CHAS. W. GREENE. 



COLUMBIA, MISSOURI, October 1, 1907. 



