Note. — The Parts of Vol. XIII of the Manual were i:<sued to 

 subscribers upon the following dates: 



Part 49, including pp. 1-64, plates 1-15, August 3, 1891. 

 Part 50, including pp. 65-112, plates 16-35, November 8, 1891. 

 Part 51, including pp. 113-160, plates 36-55, January 80, 1892. 

 Part 52, including pp. 161-196, plates 56-74, March, 1892. 



