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Published online by Cambridge University Press: 27 March 2009
Vol. 18, p. 749. Table IIIA, and in line below, for ·317 read ·371.
Vol. 18, p. 757. Four lines above Table VII, for 2·8 read 2·7.
Vol. 19, p. 338. Delete footnote 3.
Vol. 19, p. 340. Eight lines from top, for 0·066 read 0·666.
Vol. 20, p. 545. Table II, for 5·02 read 6·02.