ERRATA. 



SECTION A. 



p. 66, 1. 4 from end, in denominator, for m read u\. 



p. 68, last line, before da, for ] read } . 



p. 69, 1. 3 and 1. 5, for xa read x a . 



p. 70, 1. 9 from end add ] at end of denominators, and in second expression for da read \da\. 



p. 83, line 8 from end, for z($) read k(B)- 



