Vlll 



used at once for turning- to the proper pag-e of the Subject Index. This 

 is done by looking- at the numbers at the top corners of the pages. 



If the reader remember the name of the author of a paper on a 

 given subject, he will probably find it convenient to refer to the 

 Author Oataiog-ue rather than to the Subj(;ct Catalog-uc. 



In the Author Catalogue the numbers placed within s(|uare Itrackets 

 at the end of each entry are Registration numbers, and serve to 

 indicate the scope of each paper indexed. The meaning of these 

 numbers will at once be found by reference to the Schedule. 



In case the abbreviated titles of Journals are nut luiderstood, a key 

 to these is pro\'ided at the end of the volume. 



Topographical Symbols. 



In this volume geographical position is denoted bv one or two letteis 

 pimted 111 italics. The meaning of these symbols Will Ije found in the 

 system of Topographical Classilication which is printed in four languao-es 

 and placed between the Schedules and the Author Catalogue. Thus"///' 

 means " occurruig in In-ance " or " with reference to France " 



