ERRATA. 



Proceedings No. B 523.— Paper by Miss M. P. Fitzgerald. 



Page 96. — The heading (b) should have been placed in middle of page 95, 

 above par. beginning " The section area ..." 



Page 100. — The heading (d) should have been placed on page 99, above par. 

 beginning " The section area ..." 



Page 102. — The heading (e) should have been placed on page 101, above par. 

 beginning " The section area of . . . "' 



Page 106.— The italic heading should have been placed in middle of page 105, 

 above italic heading (a). 



Page 109. — The heading (a) should have been placed on page 108, above 

 par. beginning " Both the sectional area ..." 



Page 110. — The heading (b) should have been placed on page 109, above par. 

 beginning " The sectional area ..." 



