Abstract

In the May No., 1960, p. iii, ‘ Mr B. Braithwaite ’ should, of course, have been ‘ Professor R. B. Braithwaite ’.In the errata of the same No., p. 88, a mistake has been made. The following appeared : “ p. 315 insert, on the left hand side of the table of possibilities at the bottom of the page, ‘w = ’ before ‘ ˜ e’, so that‘ w = e’ stands before die lowest bracket.” Of course die end of the sentence should have read: “ ‘ w = ˜ e’ stands before the lowest bracket,”