PREFACE TO THE THIRD EDITION 



With the aim of keeping this book abreast of present- 

 day bacteriologic science, the entire work has been care- 

 fully revised and considerable new matter has been added. 

 Thus, the important role played in the transmission of 

 disease by vermin has led to the addition of an article 

 on Pediculosis and Disinfestation; the wide-spread em- 

 ployment of the antiseptic treatment of infected wounds, 

 to a note on Dakin's solution and the chloramines; the 

 frequent occurrence of gas gangrene in war wounds, to 

 the inclusion of Bacillus perfringens; the recent pandemic 

 of influenza, to a note on the virus of that disease. 



In connection with the chapter on INIalaria, it has been 

 deemed advisable to add a description of the life-history 

 of mosquitoes. The chapter on the Pneumococcus now 

 takes up the different types of organisms according to the 

 classification of Cole and Dochez. Under vaccine therapy 

 the use of lipo vaccines has been discussed. Trench fever 

 has been added to the list of diseases spread by lice. 



In all of these additions, as in the original work, the 

 practical application of the newer knowledge to nursing 

 has constantly been kept in mind. 



C. F. B. 



Washington, D. C. 



