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Pure cultures of Bacterium colt in peptone water to which were 

 added for every 10 cc. as much sulphur divided in boiled water as 

 would lay on the point of the knife, formed no sulphuretted hydrogen 

 at all. Only when sterile plasmon was added, i. e., in the presence 

 of not predigested albumins, sulphuretted hydrogen was formed. For 

 the present it was only ascertained that one drop mustard oil, 

 bitter almond oil, or clove oil prevents this formation of sul- 

 phuretted hydrogen. Systematic experiments on the antiseptic action 

 of essential oils with pure cultures will follow those with milk bacteria. 



