iv PREFACE. 



out here and there publications in which -a fuller bibliography may be 

 found than is consistent with the scope and limitations of this work. 



The sections on the blood which were written for the fifth edition by 

 Professor James Ewing have been revised for this, as for the last edition, 

 in such measure as the growth of knowledge seems to require, by Prof. 

 Francis C. Wood. Prof. Wood has also written the section on malaria. 



The chapter on the nervous system has been revised by Prof. Fred- 

 erick E. Bailey. To Profs. Wood and Bailey, as well as to Prof. Eugene 

 Hodenpyl, Prof. Philip Hanson Hiss, Jr., Dr. John H. Larkin, Dr. 

 Augustus B. Wadsworth, and Dr. Charles Norris, also my colleagues, I 

 am under great obligation for aid and for many helpful suggestions in 

 various parts of this revision. 



A large number of new illustrations, both photographs and drawings, 

 have been added, to supplement or replace the old. Prof. Wood has 

 prepared a new colored plate illustrating lesions of the blood. 



I am especially indebted to Dr. Larkin for the use of many of his ex- 

 cellent preparations, from which new drawings and photographs have been 

 made, and to Dr. Freeborn, some of whose valuable preparations of 

 lesions of the female generative organs I have also used. 



The excellence of the many photographs which have been reproduced 

 in the text is due in this as in former editions to the skill of Dr. Edward 

 Learning, to whom I am much indebted. 



T. MITCHELL PRUDDEN. 



