HALOID ELEMENTS UPON BACTERIA. 171 



spirillum were placed under a bell jar beside iodoform powder 

 no development occurred, but when they were removed colonies de- 

 veloped, showing that the spirilla were not killed. 



Iodoform Ether, according to Yersin, is fatal to the tubercle ba- 

 cillus in one-per-cent solution in five minutes. Cadeac and Meunier 

 found that a saturated solution required thirty-six hours to kill the 

 bacillus of typhoid fever. 



lodol. In experiments made by the writer (1885) this agent was 

 found to be without germicidal power. Riedliii found it without any 

 action, even upon the cholera spirillum. 



Hydrofluoric Acid, HFL From a series of experiments made 

 with this gas, Grancher and Chautard arrive at the conclusion that 

 " the direct and prolonged action of hydrofluoric acid upon the tuber- 

 cle bacillus diminishes its virulence but does not kill it." 



