1910.| The Chemical Dynamics of Serum Reactions. 499 
The point of diversion for the curve of complete lysis appeared to lie 
near the point (y= 15,%= 19), from equation (6) y? = cv; thus, c = 11°'8. 
These approximations were subsequently modified to ¢ = 11°37, and 
z for complete lysis lO, 
z for lowest partial lysis = 0°54. 
II. y and z varying; « constant. dz/dt=0. Vide Chart 2—The 
following experiment is taken from Arrhenius (‘Immuno Chemistry,’ 
Percentage of Lysis 
© = Observed value 
The line is calculated 
English Edition, p. 225), for his value } = 6, 7.c., 7 = 0°24 per cent. I have 
expressed his units in percentages, ¢.g., y = 2 means a = 50 :— 
| 
| 
Percentage lysis. y used. y calculated. | 
| 
| 
37 0 °4 0 °169 | 
81 1:2 1°52 | 
87 2-0 2-01 | 
92 4 °O 3°0 | 
35 8-0 8-9 | 
24 12 °0 12°14 | 
e = 87°5, z = 0:08 for 92 per cent. lysis. 
