76 Mr. A. G. R Foulerton and Dr. A. M. Kellas. [Mar. 30, 



Table IV. 



Acidity of 



solution 

 estimated in 

 terms of 



nitric acid. 



J. GHlp6I , 3)tjIll*G 

 £lt wllicll 



experiment 



was 

 carried, out, 



B. anthracis 

 (sporing 

 culture) . 



B. typhosus. 



B. pyo- 

 cyaneus. 



B. prodigiosus. 



Duration of 

 exposure. 



Duration of 

 exposure. 



Duration of 

 exposure. 



Duration of 

 exposure. 





15 minutes. 



30 minutes. 



" Momentary." 



15 minutes. 



30 minutes. 



" Momentary." 



15 minutes. 



30 minutes. 



" Momentary." 



15 minutes. 



30 minutes. 



f 





" Momenta] 





■ °c. 



























a. 0"05 p.c. ... 



o- 



+ •. 



+ 



+ 



+ 











+ - 











+ 



Very 





























scanty 







15 



+ 























+ 











+ 











b. 0-1 p.c. ... 







+ 



+ 



+ 



+ 























+ 











15 



+ 



































+ 











o. 0'15 p.c. ... 







+ 



+ 



+ 



+ 



































15 



+ 















































d. 0-2 p.c. ... 







+ 



+ 



+ 



Very 











































scanty 





















15 



+ 















































e. 0-25 p.c. ... 







+ 



+ 











































15 



+ 















































VII. — As to the Action of Ozone and Hydrogen Peroxide Formed in 

 the Air as the Eesult of the Electrical Discharge. 



Ozone and hydrogen peroxide had to be considered amongst the products 

 resulting from electrical discharge in an atmosphere of common air and in 

 the presence of aqueous vapour, for certain quantities of these substances 

 would doubtless be taken up in solution by the bacterial emulsion. 



But under the conditions of the experiments, that is to say with a 

 simultaneous formation of nitrous acid, it is, we think, quite certain that any 

 quantity of ozone or hydrogen peroxide which passed into solution would be 

 immediately decomposed. And, therefore, the importance of these two 

 substances in these experiments probably does not lie in any relation to 

 their germicidal action, but rather in the part which they play in the 

 oxidation of the nitrous compounds. 



Peroxide of hydrogen, however, became of direct importance in some 

 experiments in which the electrical discharge was effected in an atmosphere 



