MORPHOLOGY AND PHYSIOLOGY OF BACTERIA. 127 



trie light acts like sunlight or daylight, the results being de- 

 pendent on the intensity of the light. The violet part of the 

 spectrum is most active. 



The influence of electricity upon bacteria has not yet been 

 fully studied. Apparently the destruction of bacteria re- 

 ported as having been effected by electricity was the result 

 of electrolysis of the medium. 



It appears probable that X-rays do not produce impor- 

 tant effects on bacteria, although further investigation of 

 this subject is needed. The success which has attended the 

 use of light rays and X-rays in the treatment of lupus and 

 other diseases is not necessarily to be explained as the result 

 of bactericidal action of the rays. 



