NOTE. 



The 12 parts of volume 13 of the Contributions were issued as 

 follows : 



Part 1, pages 1 to 44, June 30, 1909. 

 Part 2, pages 45 and 46, February 21, 1910. 

 Part 3, pages 47 to 92, June 8, 1910. 

 Part 4, pages 93 to 132, June 11, 1910. 

 Part 5, pages 133 to 142, June 22, 1910. 

 Part 6, pages 143 to 246, October 31, 1910. 

 Part 7, pages 247 to 280, December 31, 1910. 

 Part 8, pages 281 to 290, February 24, 1911. 

 Part 9, pages 291 to 312, April 11, 1911. 

 Part 10, pages 313 to 376, June 8, 1911. 

 Part 11, pages 377 to 430, July 12, 1911. 

 Part 12, pages 431 to 466, January 5, 1912. 



IV 



