194 



ACTION OF COAL-TAR PRODUCTS, 



were required (1 : 500,000 for Staphylococcus pyogenes aureus). Sta- 

 phylococcus pyogenes aureus, Streptococcus pyogenes, and Bacillus 

 anthracis were killed in thirty seconds by 1 : 1,000, the typhoid bacil- 

 lus by the same amount in thirty minutes. Boer found malachite 

 green to be still more effective than methyl violet. In his experi- 

 ments upon bouillon cultures twenty-four hours old, with two hours' 

 exposure to the action of the disinfectant, he obtained the following 

 results : 



MALACHITE GREEN. 



METHYL VIOLET (PYOKTANIN). 



Aniline Oil. According to Riedlin, the addition of 1 : 5 of ani- 

 line water prevents the development of all bacteria in nutrient gelatin. 



Aromatic Products of Decomposition. Klein has tested the 

 germicidal power of phenylpropionic and phenylacetic acids. He 

 finds that anthrax spores resist both of these acids, in the proportion 

 of 1 : 400, for two days, but in the absence of spores anthrax bacilli 

 are quickly killed by a solution of this strength. Certain non-patho- 

 genic micrococci were not killed by exposure for twenty-five minutes 

 to 1 : 200. The caseous matter of pulmonary tuberculosis infected 

 guinea-pigs after exposure for ninety-six hours to 1 : 200. 



Aseptol. A ten-per-cent aqueous solution kills anthrax spores in 

 ten minutes, and a three- to five-per-cent solution is a reliable disin- 

 fectant in the absence of spores (Hueppe). 



Benzene, C.H,. Exposure in benzol for twenty days failed to 

 destroy the vitality of anthrax spores (Koch). 



Camphor. Alcohol saturated with camphor has no effect upon 

 the virus of symptomatic anthrax (Arloing, Cornevin, and Thomas) 



The experiments of Cadeac and Meunier show that camphor (oil 



