In Vol. xliii, No. 2, through an unfortunate oversight, the scale along the ordinate was omitted from Text-fig. 1, between pages 146 and 147, as originally printed. The accompanying slip is arranged to be pasted along the left side of Text-fig. 1. The arrow at the top of the slip should be so placed as to be a continuation of the upper border of the chart.

From the scale given in this slip the relative values of the curves shown in Text-fig. 2 (page 148) can be easily determined, since this is merely an enlarged and somewhat compressed portion from the larger text-figure.

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