Key points are not available for this paper at this time.
The values of p& in Table I were incorrectly calculated. They are as follows: pI (incorrect) 1,20 2.84 1.94 1.38 1.57 1,90 1.74 1.47 2.31 pI (correct) 0.80 -0.84 0.06 0.62 0.43 0.10 0.26 0.53 -0.31
Herring et al. (Mon,) studied this question.