LECTURES ON IMMUNITY 



on the inversion of milk sugar by means of lactase or 

 emulsin, which follow a wholly different law from that used 

 in Henri 's formula. The regularity is evident only if the 

 enzyme is present in great quantity. We reproduce only 

 the first two tables (I and VII) illustrating the hydrolytic 

 action of 100 c.c. of lactase-extract or 0.2 g. of emulsin on 

 2 g. of milk sugar at 36 C. 



Here the quantity transformed is very nearly propor- 

 tional to the square root of the time of action. This cor- 

 responds to the differential equation 



d* ' 



dt 



x x (ax) 



or, in other words, the reaction-constant calculated with the 

 common formula for a monomolecular reaction should be 

 inversely proportional to the product of the rest of the 

 milk sugar and of the reaction-products. This will happen, 



