230 Theobald Smith 



The concurrence of the many aerobic bacteria with the colon 

 group in the fermentation tube even if they should be able 

 to multiply at the temperature of the thermostat is made neg- 

 ative by the fact that the former are unable to multiply at 

 all in the closed branch. 



Washington, D. C, 

 July 28, 1893. 



