^OS-] 



ON INTESTINAL ORGANISMS. 



61 



Table IV. — Experiments with Bacillus typhi in Distilled Water in 

 Contact with Copper Foil for Varying Lengths of Time. 



Table V. — Experiments with Bacillus typhi in Stone Filtered Water 

 in Contact with Copper Foil for Varying Lengths of Time. 



Table IV shows that in the experiments made with distilled water, 

 the mere contact of the copper foil with the water for from 1 to 5 

 minutes imparted to it sufficient toxicity, or oligodynamic property, 

 to kill the typhoid organisms placed in the solution within two 

 hours, when the organisms did not exceed approximately 7,000 to 

 the cubic centimeter, or 700,000 to the entire solution. Where 

 the number of organisms in the solution exceeded this number ap- 

 proximately three-tenths of 1 per cent, persisted four to eight 

 hours longer. 



