Vol. IX was issued in parts in the following order: 



N°. 1 — January 1887, Note I— XIII. 

 N°. 2 — April 1887, Note XIV— XXVL 

 N°. 3 — July 1887, Note XXVII— XXXIII. 

 N°. 4 — October 1887, Note XXXIV— XLIII. 



