INTRODUCTION. 29 



year Pasteur published a work upon Rouget du Pore, and 

 Iv6ffler 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 

 Iv6ffler 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. 



Between the years 1884 and 1892 few new bacteria 

 were discovered, attention being directed toward perfect- 

 ing the methods of technical procedure, investigating 

 interesting subjects relating to the biology of the bac- 

 teria, and the study of immunity. 



