[Material received between May 1912 and May 1913.] 
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. 
Volume XIII is in the Press. The Subject Index will bo 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 volumes for Pure Mathe- 
matics and Mechanics are published. Physics, Part I, containing 
Generalities, Heat, Light and Sound is also published. Part II, con- 
taining Electricity and Magnetism, is in the Press. 
