32 HOUSEHOLD BACTERIOLOGY. 



cause putrefaction. Each of these differences means 

 much to the trained observer, for from such result;? 

 has been and must be gathered our knowledge of 

 their probable behavior outside of the laboratory, 

 importance In the bacteriological laboratory has been found 

 out facts which in the commercial life of the world 

 mean millions of dollars ; there, too, have been started 

 experiments which have led to incalculable saving of 

 human suffering and life, through sanitation, pre- 

 ventive medicine, and surgery. 



Here we see how the little things of life have con- 

 founded the mighty and how ''the science of the 

 infinitely small," by which some one has defined bac- 

 teriology, "has become the infinitely important." 



