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INSTRUCTIONS. 



The present volume consists of 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 numbers follow one another in numerical 

 order, but all the 9999 numbers are not used. 



To enable the reader to find these numbers quickly, the first and last 

 number on the page is repeated at the right or left corner at the 

 head of each page in the Subject Index. This also has the advantage 

 of giving to the pages of the Subject Catalogue a mark by which they 

 can be distinguished at a glance from the pages of the Author 

 Catalogue. 



In each section the final arrangement of papers is in the 

 alphabetical order of authors' names. 



In order to find the papers dealing with a particular subject the 

 reader may either consult 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 outer 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 Catalogue rather than to the Subject Catalogue. 



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. 



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 in this volume is mainly that of 1904, hut 

 includes such portions of the literature of 1001-1903 as ma}- liave 

 been found to have been omitted from previous volumes, 



