192 



LECTURES ON IMMUNITY 



In the same manner TTwas found at 19.7 to be 0.067 

 and at 27 C. to be 0.105. This corresponds to an increase 

 of the velocity of reaction in the proportion 1.86: i and 

 1.87 : i respectively for an elevation of the temperature of 

 10 C. This reaction belongs, as the constancy of K indi- 

 cates, to the order of monomolecular reactions. 



In other experiments the quantity of antilysin, A, was 

 varied, and the following values of q^q were found. 

 The quantities of lysin, Z, were always the same, namely, 

 i c.c. in the first and 3 c.c. in the second fraction, and the 

 experiments were otherwise executed as indicated above. 



THE MAGNITUDE OF THE EFFECT OF DANYSZ AS DEPENDENT UPON THE 

 QUANTITY OF^ ANTITOXIN USED 



The calculated values are found under the assumption 

 that the effect is proportional to the excess of antitoxin over 

 that (0.18 c.c.) equivalent to the quantity of lysin (i c.c.) 

 present in the first fraction. This proportionality is very 

 striking in the figures above. The effect may also be cal- 

 culated as the quantity of antitoxin bound by the poison, 

 if the experiments are executed as above, minus the cor- 

 responding quantity if the total quantity of poison is added 

 at once. The figures calculated in this manner are written 

 in parentheses. 



