Curves relating log(K), measured at 30˚C, to the number of substituent groups that correspond to each series given by equations (19), (20) and (21) are shown in figure 12 and the values for the slopes and intercepts of each curve are included. It is seen that all the nine points fall on the predicted three straight lines and the indices of determination  are 0.995, 0.999 and 0.995 respectively). Equations (19) and (21) should have the same slopes equivalent to ⁽) but different intercepts.