38 



VELOCITY OF REACTIONS 



body. In 100 cc, which were 0-05 normal with 

 reference to hydrochloric acid and contained 2-23 

 grammes of egg-albumen, he dissolved 2-5, 5, 10, 

 or 20 cc. of a pepsin preparation. He determined 

 the molecular electric conductivity of the solution 



12 



10 



8 



3 6 



<o 



"GO 

 ■5 



>» 



5 4 



c 

 re 



y ° 



/ ° 



o / 

 D 2_3456 



Vq" 



Fig. 7. 



which fell from an initial value of 188-4 units 

 (Siemens) to an end-value of about 83-4 units. 

 The change of conductivity was taken as a measure 

 of the quantity digested. In the accompanying 

 diagram (Fig. 8) the square root of the time from 

 the beginning of the experiment is taken as abscissa, 

 the change A of conductivity from the original 



