ACTION OF ACIDS AND ALKALIES. 177 



killed by three successive applications. In the writer's experiments 

 (1885) the typhoid bacillus and Staphylococcus pyogenes aureus were 

 killed in two hours by a solution containing 1 : 40 of calcium oxide, 

 and 1 : 80 failed. Spores of the anthrax bacillus and of several other 

 spore-forming species were not killed by two hours' exposure to a 

 milk of lime containing twenty per cent of calcium oxide. 



12 



