244 



MICRO-OEGANISMS IN WATER 



rial present. The same results were obtained when 

 more or less highly polluted waters were examined. 



The Action of Ozone on Anthrax Spores m Sterilised Distilled 

 Water, with and without additions of Sheep-serum (Ohlmiiller) 



The action of peroxide of hydrogen on bacteria in 

 water was first studied by Van Hettinga Tromp.^ The 

 water under investigation was thoroughly shaken up 

 with this material, and the mixture was examined after 

 standing for various lengths of time. An addition of 

 1 : 10,000, preserved for one day, was usually sufficient 

 to sterilise a water, but the rapidity of the action of the 



^ Waters toff super oxyde ter Besinfectie van Drinlcwater. 



