VOLUME Lxviii CONTENTS vii 



DATES OF PUBLICATION 



No. I, July i8; No. 2, August 15; No. 3, September 16; No. 4,[October 16; 

 No. 5, November 17; No. 6, December 20. 



ERRATA 

 Vol. lxviii 



P. 114, line 9 from bottom, for fig. 53 read fig. 52 

 P. 115, line 17 from top, for fig. 58 read fig. 57 

 P. 120, line 2 from bottom, for fig. 52 read fig. 51 



