Page 108, last line of text, for P/P″ read P′/P″. Page 120, last line, for δ v read δ y . Page 123, line 10, for 4Nn read 4Nu. Page 125, line 1, for q read q. Page 126, line 12, for q read…
Page 108, last line of text, for P/P″ read P′/P″. Page 120, last line, for δ v read δ y . Page 123, line 10, for 4Nn read 4Nu. Page 125, line 1, for q read q. Page 126, line 12, for q read q. Page 135, line 5 from bottom, for y4Nsq read e4Nsq. Page 141, lines 8