PREFACE 
TO THE FIRST EDITION. 
Many of the duties of the nurse require a knowl¬ 
edge of the principles of bacteriology in order to be 
performed intelligently. It is difficult, however, for 
anyone instructing nurses, to decide just how much of 
the subject to attempt to teach. 
The basis of this book is the lecture notes that I 
have used during the last eight years in teaching the 
nurses of the Samaritan Hospital Training School. 
In incorporating them into book form I have en¬ 
deavored to present clearly and in simple language 
that portion of the subject essential for the nurse to 
know. A few blank pages have been inserted at the 
end of each chapter for the convenience of the student 
in adding useful notes from time to time. 
Harry W. Carey, A.B., M.D. 
Troy, N. Y. 
(iv) 
