Page 190, line 20, insert semi-colon after the word present. Page 195, figure 4 is inverted. Page 195, line 2 below the figure, for Pholox read Phlox . Page 211, line 9, for magneta read magenta. Page 215, last 3 lines of first column, for (AB)251.7 read for (AB)250.20
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