viii PREFACE. 



as a sanitarian has developed into one of such extra- 

 ordinary importance, specific information in regard 

 to these offices was to be given a prominent place. 

 For the same reasons, chapters on "Bacteriology," 

 "Parasites," and "The Collection and Examination of 

 Secretions and Excretions" were included in the plan. 

 Withal, every effort was to be made to be lucid in style 

 and simple in treatment. Of nursing, per se, I was 

 not to treat. 



The present volume represents my efforts to embody 

 the above ideas in a book. 



My obligation to various authors has been heavy, 

 and I wish I could make suitable acknowledgment to 

 every one upon whom I have drawn for material; 

 but the character of the book obviously makes this 

 impracticable. Nevertheless, to Professor Roger's 

 "Introduction to the Study of Medicine" and "Infec- 

 tious Diseases," to Dr. Abott's "Hygiene of Trans- 

 missible Diseases," and also to Dr. Rosenau's "Dis- 

 infection and Disinfectants," I feel reference should 

 be made. Furthermore, I would be lacking in grati- 

 tude did I not make acknowledgment to my alma 

 mater, the Johns Hopkins Medical School; the book 

 really owes its inception to the scientific spirit and 

 inspiring personality of its faculty. 



To have been a student there is a life-long pleasurable 

 memory, and a distinction which I feel can be repaid 

 only in small measure by describing my efforts as 



