VII 



INSTEUCTIONS. 



The present volume consists of three parts : — 



(«) 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, for it is intended to fill 

 up the gaps by interpolation of such additional sections as may be 

 required for additions to the system of classification in future years. 



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

 number on the page is repeated at the right and 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 



