VELOCITY OF REACTION. HOMOGENEOUS SYSTEMS 79 



Bayliss 1 has investigated the progress of the action of 

 trypsin on casein by means of the method of Sjb'qvist. A 

 solution of 8 per cent of the sodium salt of casein was pre- 

 pared and to 6 c.c. of this solution 2 c.c. of 0.5 normal 

 ammonia and 2 c.c. of a 2 per cent solution of trypsin were 

 added. The conductivity was measured at different times 

 and its increase (at 39 C.) plotted in a curve. This curve 

 tends to an upper limit. By measuring the ordinates ( Y) 

 in millimeters of this curve I have found the following 

 values : 



The calculated values are found with the aid of the 

 formula KP = 320, adopted for the pepsin action. They 



1 Bayliss : Archives des sciences biologiques, II. Suppl. p. 261, St. Peters- 

 burg, 1904. 



