If the reader remember the name of the Author of a paper on a 

 g-iven subject, he will probably find it convenient to refer t-o the 

 Authors' Catalog-ue rather than to the Subject Catalogue. 



In the Authors' 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. 



GEOGRAPHICAL SYMBOLS. 



When one or two letters printed in italics immediarely follow the 

 registration number, these letters denote geographical position. The 

 meaning of these geographical symbols wdll be found in the system of 

 Topographical Classification which, in this volume, is printed in four 

 languages, and placed between the Schedules and the Authors' 

 Catalogue. Thus fg means " occurring in South Africa " or '• with 

 reference to South Africa." 



