INSTEUCTIONS. 



The present volume contains three parts, {a) Schedules and Indexes 

 in four languages; (b) An Author Catalogue ; (c) A Subject Catalogue. 



The Subject Catalogue is divided into sections, each of which is 

 denoted by a four-figure number between 0000 and 9999 called 

 a Registration number. These follow one another in numerical order. 



To find the papers dealing with a particular subject the reader 

 may consult either the Schedule or the Index to the Schedule. 

 The numbers given in the index are Registration numbers, and can be 

 used at once for turning to the proper page of the Subject Index. This 

 is done by looking at the numbers at the right-hand top corners of 

 the pages. 



In each section the final arrangement of papers is in the 

 alphabetical order of authors' names. 



In the Author Catalogue the numbers placed within square brackets 

 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. 



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 Catalogue rather than to the Subject Catalogue. 



In case the abbreviated titles of Journals are not understood, a key 

 to these is provided at the end of the volume. 



The literature indexed is mainly that of ISOo, but includes those 

 portions of the literature of 1901--1904 in regard to which the index 

 slips were received by the Central Bureau too late for inclusion in 

 the previous volumes. 



