Ig09] STON E—ELECTRICITY AND MICROORGANISMS 361 
considerable increase in the number of bacteria in water resulting 
from electrical stimulation. 
The number of organisms in the electrically treated jar increased 
from about 3000 to 43,000 on the first day, and to 108,000 on the 
second day. 
TABLE II 
Showing the influence of electrical stimulation (galvanic currents) on Pseudomonas 
radicicola. First cultures made 24 hours after treatment. 
NUMBER OF BACTERIA IN 1° 
DaTE OF MAKING 
CULTURE 
Normal Electrical 
January 23.... 6,000 15,000 
anuary 24 50,893 3,178,246 
January 27 52,741 4,287,002 
January 31 50,217 5,210,112 
February 4 50,217 
February 8 42,112 10,200 
February 12... 41,110 50,000 
February 16... 35,000 4,000 
TABLE Ii 
Showing the influence of electrical stimulation (galvanic currents) on Bacillus 
megaterium DeBary. First cultures made 24 hours after treatment. 
NUMBER OF BACTERIA IN 1° 
DATE OF MAKING : 
CULTURE . 
Normal Electrical 
February 25 ... II,000 243,000 
February 28 .. 21,000 3,462,000 
March 4.42. 25,400 600, 
Maren 67 p5. 20,000 4,566,400 
March 12.2. 32,000 »950, 
March 165.451. 10,000 243,000 
atch aa ass, 35,000 500,000 
March 24...... 2, 22,000 
The experiments given in the preceding tables were made in wide- 
mouthed jars approximately 10°™ in diameter and 21°™ high (fig. 1). 
Those containing the electrically treated water were provided with 
electrodes made of copper and zinc, which were connected with a wire 
as in the last experiment. The electrodes were about 4°" wide and 
long enough to extend over the lip of the bottle. The strength of 
Current developed in this galvanic cell was about 0.3 milliamperes, 
and it remained very constant throughout the experiments. The 
