GERMICIDES AND ANTISEPTICS. 229 



but in the proportion of 1 : 3,000 their develop- 

 ment is retarded (Koch). One part in three hun- 

 dred prevents the development of bacteria in 

 unboiled beef-infusion ; and one part in thirty- 

 five kills the bacteria of broken-down beef-tea (de 

 la Croix). 



Pyrogallic Acid. A solution of one or two per 

 cent prevents, for some months, the development 

 of odors and of microscopic organisms ; a solu- 

 tion of 2.5 per cent removes the odor from fluids 

 in a state of putrefaction, and destroys bacteria 

 (Bovet). 



Pyroligneous Acid destroys the spores of the An- 

 thrax bacillus in two days (Koch). 



Quinine. A 10 per cent solution of sulphate of 

 quinine has no action upon the bacterium of symp- 

 tomatic anthrax (Arloing, Cornevin, and Thomas). 

 One per cent of quinine, dissolved with muriatic acid, 

 destroys the spores of bacilli after ten days' ex- 

 posure (Koch). The development of bacteria in 

 a culture-fluid inoculated with a drop of turbid 

 fluid from malarial soil is prevented by a solution 

 of muriate of quinine of 1 : 900. From 1 : 1,000 

 to 1 : 1,500 non-putrid development begins. In a 

 gelatine-culture from malarial soil no development 

 occurred in solutions containing 1 : 1,500 ; non- 

 putrid development occurred from 1 : 2,000 up to 

 1 : 3,000 ; and the development was accompanied 

 by putrefaction when less than 1 : 9,000 was used 

 (Ceri). 



Salicylic Acid. In the writer's experiments, this 



