1909] . STONE—ELECTRICITY AND MICROORGANISMS 367 
and 5 P. M. respectively for two days. At the close of the experiment 
there was little or no difference between the normal and the treated 
samples. The subsequent charges, eeasiplnn, failed to prevent an 
_ increase in the number of bacteria. 
TABLE IX 
Showing the influence of electricity (positive and negative charges) on the bacteria 
in milk. Electrical jars charged with roo sparks each 10 A. M. and 1 P. M. an 
each day. 
NUMBER OF BACTERIA IN 1€C 
DATE OF MAKING 
CULT ; s a i ‘ : 
cha Nail ee — —— er 
auly 3, 10. A. M.... 6. 5,580 5,580 5,580 
Bear 3, 1-Bi M.S. 21,440 381 404 
ae eee 78,533 380 487 
ouly 4,10 A. M....... 268,500 5,664 10,367 
euy 4, 4 PLM... 863,830 10,806 26,990 
July 5, 10 A.M....... 17,800,000%* 19,180,000* 19,910,000* 
* Milk sour. 
TABLE X 
s ing the influence of electricity (positive and negative charges) on the bacteria 
= in ee ies jars charged with 50-100 sparks each every hour (10 A.M 
_ ®.M. inclusive). 
NUMBER OF BACTERIA IN 1CC 
Date OF MAKING | 
CULTURE 
yy | Normal Positive Negative 
Be july610 A.M... 219,250 219,250 219,250 
July 6, Bo DM 1,000,000 481 ate. 
July 6, 5:30 P. M. 10,655,000* 11,522* 935 
* Sour. 
____As it was one of the objects of these experiments with milk to 
_ determine the maximum stimulus, the charges were increased. For 
this reason the experiment shown in table X was made, where an even 
@ more marked falling-off in the number of organisms is shown. The 
a €xperiment lasted only a few hours, and was not continued on account 
__ Of the souring of the milk. 
___ The hourly charges of 50 to roo large sparks, however, did not 
entirely prevent the organisms from developing, but the falling- 
4 pot from over 200,000 to a few hundred in 1°° was significant. 
