42 
the curve coincides with the 7’s of diminishing activity according 
to table 21. Between 7’—120 and 7’= 230 there seems to have 
Figure 13. 
ad 
0.6 
0.5 
0.4 
0.3 
0.2 
0.1 
120 230 300 360 420 450 480 540 
minutes. 
been in the beginning another period of some decay, followed by 
a normal course from 7’= 230 to 7’= 360. 
This peculiar type of curve, first a retardation and then again 
pada TABLE 21. 
T (minutes) | y y (in ee en after 
120 0.255 0.175 
230 0.385 0.130 
300 0.465 0.115 
360 0.535 0.08 
420 0.53 0.075 
450 0.575 0.08 
480 0.585 0.075 
540 0.625 0.075 
