122 PHYSIOLOGY OF THE BACTERIA. 



Other gases studied by the same savants have 

 given the following results : 



Hydrogen at first causes an acceleration of 

 movement, which is maintained for several days ; 

 then movement becomes less active, and finally it 

 ceases altogether. 



Carbonic Acid. Contrary to the facts stated 

 by Pasteur, this agent was found to paralyze the 

 bacteria, and reduced them to complete immobility. 

 If the carbonic acid is displaced by oxygen, the 

 bacteria resume their activity. 



Chloroform. This substance, according to the 

 researches of Miintz, arrests the vital phenomena 

 of organized ferments. Miintz uses this charac- 

 ter in order to recognize the soluble ferments, upon 

 which it has no action. 



Boracic Acid. Since the labors of Dumas, 

 which have demonstrated that boracic acid kills 

 the inferior organisms by depriving them of their 

 oxygen, this substance has been employed in vari- 

 ous circumstances as an antiseptic. 



Sulphate of Quinine. The action of quinine, 

 either in the state of chlorhydrate or of sulphate, 

 is not yet well established. The experiments of 

 Binz, Manassein, Kroevitsch, Bochefontaine, etc., 

 have, in truth, given contradictory results. 



Carbolic Acid. The experiments of Manas- 

 sein have demonstrated that ^th per cent of car- 



