Some irregularities in numbering.
Volumes for 1850-1854 called new ser., v. 1-5; 1855-1869 called 3rd ser., v. 1-17; 1870-1883 called 4th ser., v. 1-14; 1884-1900 called 5th ser., v. 1-20; 1921-1928 called 7th ser., v. 1-8, and also called v. 76-83; 1929- v. 84-