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INSTRUCTIONS. 



The present volume cousists of three parts : — 



(a) Schedules aud Indexes in four languages. 

 {b) An Authors' Catalogue, 

 (c) A Subject Catalogue, 



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

 denoted by a four-figure number between OCOO and 9999. 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 interpola- 

 tion of such additional sections as may be required for additions to the 

 system of classification in future 3'ears. 



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

 number on the page is repeated at the head of the page. In looking 

 up a subject, these numbers, which are called Registration numbers, 

 should be used instead of the ordinary pagination. These Registration 

 lumibers serve to divide up the subject into sections, each of which 

 deals with related matter. 



Thus Physical (J oology is divided into 10 General Physical 

 Geology, 15 Glacial Geology, 2U Volcanic (^leology, and 25 Seismic 

 Geology. Each of these sections has a mimber of topographical 

 sub-sections. 



Id each section the final ari'angement of papers is in the alphabetical 

 order of authors' names. 



In order to find the papers dealin};- 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 



