METHODS OF STUDY 17 



cal part of her training without teaching her the 

 principles which should guide the performance of 

 her duties, for without this knowledge she holds in 

 her hands a capacity for doing infinite harm; she 

 cannot avoid dangers which she does not recognize. 



To the medical student the study of bacteriology 

 has an entirely different meaning; his application 

 of the knowledge gained is for other purposes, viz. 

 as a means of diagnosis and treatment, two ob- 

 jects which do not in any way concern the nurse, 

 whose sole interest is for the purpose of enabling 

 her to intelligently execute her nursing and house- 

 keeping technique, the two departments being 

 too closely related to be separated. 



In the recent development of bacteriology as 

 related to disease, a tendency has been observed to 

 work along two lines, pathologic and hygienic ; the 

 first, considering chiefly the effects produced upon the 

 body by the presence of bacteria and their toxins, and 

 the defenses of the body ; while in hygienic bacte- 

 riology especial attention is given to the channels by 

 which bacteria leave the body and how they may 

 again infect healthy persons. 



Where Bacteria are Found. Before beginning the 

 study of bacteria it is necessary to have firmly fixed 

 in the mind the fact that bacteria are found every- 



