4 PREFACE. 



modified cellular activity would enable the student to interpret such 

 departures from the normal as he might observe in particular speci- 

 mens, provided he was familiar with the normal structures of the 

 body. In this belief the writer has devoted most of his space to a 

 description of the normal structures, and has contented himself 

 with only a brief account of the histology of the more prevalent 

 morbid processes. He was encouraged in this course by the con- 

 sciousness that in individual cases the application of the principles 

 involved might be more successfully made by the instructors under 

 whose guidance these studies were pursued. For the sake of clear- 

 ness, however, examples of morbid structure have been selected 

 from various parts of the body to illustrate the different phases of 

 the processes that were being outlined. 



Those histological methods and data which are utilized for the 

 purpose of clinical diagnosis have been almost entirely omitted, be- 

 cause they are fully described in special works on that subject and 

 are not strictly within the limits assigned to this more elementary 

 book. 



. Occasional reference has been made to technical journals on his- 

 tology. Those which contain abstracts of the current literature on 

 that subject, and which will, therefore, be of greatest use to the 

 student, are : The Journal of the Royal Microscopical Society, Zeit- 

 schrift fur wissenschaftliche Mikroskopie, and Centralblatt fur allge- 

 meine Pathologic und pathologische Anatomie. The student is also 

 referred to Mallory and Wright's Pathological Technique, Lee's Mi- 

 crotomist's Vade Mecum, and to the more recent German revised 

 edition, Grundzuge der mikroskopischen Technik, by Lee and Mayer. 

 It may be that well-founded exceptions will be taken to some of 

 the explanations of morbid processes which are here offered ; but 

 it is the author's hope that he has not advanced theoretical views 

 with sufficient emphasis to mislead the student. Should the general 

 plan of the work meet with a kindly reception, it will be his 

 endeavor to correct, in a future edition, such errors and omissions 

 as may be revealed by friendly criticism. 



E. K. D. 

 NEW YORK, October, 1898. 



