F. G. GUSTATSON 



623 



Rate of CO2 ppoduction 

 122%! 



9.00 pH 



Fig. 2. Respiration of Penicillium chrysogenum. The curves show rate plotted 

 against pH, and represent the same data as in Fig. l- Curve A represents the 

 respiration at the end of 8 minutes in the solution; Curve B at the end of 20 

 minutes; Curve C at the end of 30 minutes; and Curve D at the end of 60 minutes. 



