Vlll 



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

 is done by looking at the numbers at the 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 convenieut 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. 



There is also an alphabetical index in which the four-figure nundjers 

 are Kegistration numbers, while the tliiee-figure numbers give the 

 page on which a substance is mentioned. 



