DATES OF ISSUE OF THE PARTS OF VOL. XVIII. 



Part 69, pp. 1 to 64, plates 1 to 10, January 20, 1906. 

 Part 70, pp. 65 to 160, plates 11 to 20, April 10, 1906. 

 Part 71, pp. 161 to 272, plates 21 to 34, October 2, 1906. 

 Part 72, pp. 273 to 357, plates 35 to 51, January, 1907. 

 Title-page, Contents and Introduction, pp. i to xii, January, 

 1907. 







