45 
Figure 15. 
9 8.5 8 1.5 7 6.5 6 
pH 
above a certain value of urease concentration constancy of specific 
activity, below it a decrease. 
The peculiarity, mentioned in the beginning of this part, that 
small concentrations of urease showed less constancy of power than 
larger ones, becomes now not only intelligible, but even adduces 
evidence to the theory. 
For, evidently, in regions, where the specific activity is falling 
off, a slight change in concentration of the urease will have far 
more effect than at higher concentrations, where the specific activity 
is constant. To be continued. 
