April 21, 1905.] 



SCIENCE. 



609 



Table I. Experiments with Bacillus Coli. 





Water without Copper Foil. 



Triple 

 Distilled 

 Water. 



Filtered 



Tap 

 Water. 



Tap Water. 



Plates made at time 

 of adding culture... 

 Plates made at end of 



Plates made at end of 



Plates made at end of 

 twenty-four hours... 



Plates made at end of 

 forty-eight hours... 



Plates made at end of 



Plates made at end of 



Plates made at end of 

 21 days 



Plates made at end of 

 28 days... 



Plates made at end of 



7,746 

 7,655 

 7,735 

 1,000,000 

 1,200,000 

 1,200,000 

 1,060,000 

 700,000 

 700,600 

 602,000 



11,246 

 5,075 

 3,115 

 1,000,000 

 1,600,000 

 1,000,000 

 910,000 

 462,000 

 462,466 

 456,000 



8,283 

 7,665 

 7,000 

 1,500,000 

 2,000,000 

 1,200,000 

 2,245,000 

 650,000 

 649,666 

 693,000 





Water with Copper Foil. 



Triple 

 Distilled 

 Water. 



Filtered 

 Water. 



Tap Water. 



Plates made at time 

 of adding culture... 

 Plates made at end of 



Plates made at end of 



Plates made at end of 

 twenty-four hours... 



Plates made at end of 

 forty-eight hours... 



Plates made at end of 

 6 days 



Plates made at end of 



Plates made at end of 

 21 davs 



Plates made at end of 

 28 days 



Plates made at end of 



8,866 

 No or- 

 ganisms. 



(( 



u 

 l< 

 i I 

 il 

 II 

 II 

 1 1 



4,410 

 No or- 

 ganisms. 



1 1 

 <i 

 1 1 

 II 

 II 

 II 

 II 

 II 



6,790 

 No or- 

 ganisms. 



I may say that every single experiment 

 which we have conducted, not only those 

 given in the foregoing tables, but all others, 

 shows that copper foil is exceedingly toxic 

 to colon and typhoid bacilli, particularly 

 the latter. 



* Bowlton cultures of the different samples of 

 water gave at the end of sixty days with Widal's 

 test the characteristic behavior of typhoid organ- 

 isms. 



Table II. Experiments with Bacillus 

 Typhosus. 





Water without Copper Foil. 



Triple 

 Distilled 

 Water. 



Filtered 



Tap 

 Water. 



Tap Water. 



Plates made at time 

 of adding culture... 



Plates made at end of 

 four hours 



Plates made at end of 



Plates made at end of 

 twenty-four hours.. 



Plates made at end of 

 forty-eight hours... 



Plates made at end of 



X laics IlldUc a.\i cliu Oi 



Plates made at end of 

 21 days 



Plates made at end of 

 28 days 



Plates made at end of 



3,740 

 2,835 

 3,850 

 3,750 

 3,815 

 1,850 

 16,380 

 39,690 

 153,600 



4,750 

 No or- 

 ganisms. 



11 

 11 

 II 

 II 



3,675 

 3,815 

 1 995 

 1,435 

 1,540 



3,920 

 65,500 

 221,867 





Water with Copper Foil. 



Triple 

 Distilled 

 Water. 



Filtered 

 Water. 



Tap Water. 



Plates made at time 

 of adding culture... 



Plates made at end of 

 four hours 



Plates made at end of 



Plates made at end of 

 twenty -four hours... 



Plates made at end of 

 forty-eight hours. . . . 



Plates made at end of 



Plates made at end of 



Plates made at end of 



Plates made at end of 



28 days 



Plates made at end of 



3,986 

 No or- 

 ganisms. 



1 1 

 1 1 

 II 

 II 

 II 

 II 

 II 

 II 



127 

 No or- 

 ganisms. 



II 

 11 

 1 1 

 II 

 II 

 II 

 II 

 II 



1,400 

 No or- 

 ganisms. 



It will be seen by consulting the table 

 that in the filtered water to which no cop- 

 per foil had been added, the typhoid or- 

 ganisms did not grow and multiply as was 

 the case with the tap water and distilled 

 water, although there were a larger number 

 of organisms to begin with. This also 

 applies in a measure to the colon bacilli, 

 where there is a very marked inhibiting 



