INTRODUCTION, 29 



year Pasteur published a work upon Rouget du Pore, and 

 L,6ffler and Schiitz reported the discovery of the bacillus 

 of glanders. 



In 1884, Koch reported the discovery of the "comma 

 bacillus," the cause of cholera, and in the same year 

 Ivoffler discovered the diphtheria bacillus, and Nicolaier 

 the tetanus bacillus. 



In 1892, Canon and Pfeiffer discovered the bacillus of 

 influenza. 



In 1892, Canon and Pielicke first found the bacillus 

 now thought to be specific for measles. 



In 1894, Yersin and Kitasato independently isolated 

 the bacillus causing the bubonic plague then prevalent 

 at Hong-Kong. 



A new era in bacteriology, and probably the most 

 triumphant result of the modern scientific study of dis- 

 ease, was inaugurated in 1890 by Behring, who presented 

 to the world the ' ' Blood-serum therapy, ' ' and showed as 

 the result of prolonged, elaborate, and profound study of 

 the subject of immunity that in the blood of animals 

 with acquired immunity to certain diseases (diphtheria 

 and tetanus) a substance was held in solution which was 

 potent to save the lives of other animals suffering from 

 the same diseases. 



