58 THE STORY OF THE BACTERIA. 



And so through the long list of ills which come 

 upon the human frame, from known or un- 

 known causes the wise physician guides and 

 aids the natural recuperative tendencies of the 

 body cells. 



Among all the varied changes in structure 

 and disturbance in activities of the body which 

 thus constitute disease there are, as we have 

 seen, several, and these most important ones, 

 which have recently been proven to be caused 

 by bacteria. To some of these we must now 

 turn our attention so as to learn how the dis- 

 turbances are brought about, and what we 

 may do for ourselves to avoid them. 



