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DIRECTIONS. 



The present volume contains a list of the periodicals that are 

 examined by the Regional Bureaus engaged in the preparation of the 

 index slips used in the volumes of the International Catalogue of 

 Scientific Literature. 



It will be found that lists have already been prepared for most of the 

 principal conntiies of the world, but in a few cases the Regional 

 Bureaus have not yet been able to complete the work, and the lists for 

 the countries they represent will be issued, together with additions to 

 the present lists, at a later date. 



The list i)repared by each Regional Bureau is divided into three 

 colnmns. The first column contains the abbreviation used in the 

 Catalogue to represent th^i periodical. The second column contains the 

 full title of the journal and its place of pubhcation. The third column 

 contains a number. These numbers are usually consecutive, and are 

 I'eferred to in the short lists given at the end of each volume of the 

 Catalogue. 



In most cases the lists of journals here published have been in use 

 at the Regional Bureaus and at the Cential Bureau for moi'o than a 

 year, and during that time additions have been made to the original 

 lists. 



These additions are sometimes incorporated in the original lists, but 

 in other cases they are appended as " addenda " to the list to which they 

 properly belong. 



In respect of each periodical, the last entry in the second column is 

 one or more of the letters A to R. These letters denote the sciences^ 

 as explained in the preface, under which it is thought that scientific 

 papers occurring in the periodical are likely to be catalogued. AVhere 

 the indication is [A — R] it is to ba understood that papers belonging- 

 to all bi'anches of science may be looked for in the periodical to the 

 title of which these letters are attached. 



The rules according to which the abbreviated titles have been formed 

 from the full titles of the journals will be found in the Instructions for 

 the use of Regional Bureaus which are printed in four languages at 

 the end of this volume. 



The system of transliteration employed by the Russian Regional 

 Bureau will explain the spelling of transliterated Russian names. 



