[Material received between Sept. 1911 and Sept. 1912.] 



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 published. The Subject Index will be issued 

 separately for each of the seventeen sciences dealt with in the 

 International Catalogiie of Scientific Literature, and will be arranged 

 in accordance with its Schedules. The volumes for Pure Mathe- 

 matics, Mechanics and Physics are published. 



