iv 
[Material received between Jan. 1907 and June 1907.] 
The International Catalogue of Scientific Literature is in effect a 
continuation of the Royal Society’s Catalogue of Scientific Papers which 
will, when completed, consist of an Author Catalogue and Subject 
Index covering the period of 1800-1900. Twelve quarto volumes of 
the Author Catalogue covering the period 1800-1883 have already been 
published; the volumes for 1884-1900 are in course of preparation. 
The Subject Index will be issued separately for each of the 
seventeen sciences dealt with in the International Catalogue of 
Scientific Literature, and will be arranged in accordance with its 
Schedules. The volume for Pure Mathematics is in the Press. 
o 
