196 ACTION OF COAL-TAR PRODUCTS, 



to six weeks, and that alkaline fermentation of urine was prevented 

 by 1:1,000. 



Indol. When added in excess to water this agent failed to de- 

 stroy anthrax spores in eighty days (Koch). 



Lanolin. According to Gottstein, various microorganisms tested 

 by him failed to grow in cultures after having been in contact with 

 pure lanolin for five to seven days. 



Naphthol. In the proportion of 1: 10,000 naphthol prevents the 

 development of the glanders bacillus, the anthrax bacillus, the ty- 

 phoid bacillus, the micrococcus of fowl cholera, of Staphylococcus. 

 aureus and albus, and of several other microorganisms tested by 

 Maximovitch. The same author states that although insoluble in 

 cold water, water at 70 C. dissolves 0.44 in one thousand parts. 

 When urine is shaken up with naphthol in powder it does not undergo 

 fermentation. 



In the experiments of Foote hydronaphthol was found to show 

 some germicidal power in the proportion of 1 : 2,300, but the conclusion 

 is reached that a saturated aqueous solution (1: 1,150) does not equal 

 a one-per-cent solution of carbolic acid or of creolin. 



Olive Oil. Anthrax spores germinate after having been im- 

 mersed for ninety days in pure olive oil (Koch). 



Oil of Mustard. Koch found that the development of anthrax 

 spores is prevented by 1: 33,000. 



Oil of Peppermint. A five-per-cent solution in alcohol failed in 

 twelve days to destroy anthrax spores, but the development of these 

 spores is restrained by 1: 33,000 (Koch). 



Oil of Turpentine destroys anthrax spores in five days, but failed 

 to do so in one day (Koch). The development of anthrax spores i& 

 prevented by 1:75,000 (Koch). The addition of 1:200 to nutrient 

 gelatin prevents the development of bacteria (Riedlin). An excess 

 of oil of turpentine added to a liquefied gelatin culture of Staphylo- 

 coccus aureus does not destroy this micrococcus in five hours (v. 

 Christmas- Dirckinck- Holmf eld) . 



Skatol in excess in water has no germicidal power, as tested upon 

 anthrax spores (Koch). 



Smoke. The researches of Beu show that meats which have 

 been preserved by smoking commonly contain living bacteria cap- 

 able of growing in culture' media ; and Petri has shown that pork 

 which has been salted for a month and then smoked for fourteen 

 days may still contain the bacillus of rothlauf in a living condition, 

 as shown by inoculation experiments. It was not until about 

 six months after smoking that the bacillus failed to give evidence 

 of vitality. 



Thymol. A five-per-cent solution in alcohol does not destroy 



