244 



MICRO-ORGANISMS 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 in Sterilised Distilled 

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



The action of peroxide of hydrogen on bacteria in 

 icater was first studied by Van Hettinga Tromp. 1 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 



1 Waterstoffsuperoxyde ter Desinfectie van Drinkwatcr. 



