Memoirs, and not to the work in which they originally appeared ; or they may be 

 xinacquainted with the language in which the Memoirs were written ; in either of 

 which cases they will find the additional references very useful. The language 

 of the Translation may generally be inferred from the nationality of the work 

 in which it appears, unless otherwise specified. 



Whenever the Royal Society has not been able to procure the original Memoir, 

 or a Reprint, the abbreviation \_Transl.~\ is placed after the Title. 



Abstracts of Memoirs have been indexed as well as the Memoirs themselves. As 

 the first and last page are given in each reference, the reader will generally have 

 little difficulty in distinguishing Abstracts from entire Memoirs. 



Reports on Papers are usually omitted ; but as there are some which have an inde- 

 pendent value, they have in certain cases been indexed under the name of the 

 Reporter. In like manner many of the Eloges of scientific men read before the 

 Institute of France have been given. 



In this work no Title has been inserted at second hand. With the exception of 

 those from works indexed abroad in whole or in part (marked respectively by a 

 star (*) or an obelus (f) in the List of Abbreviations), all the Titles have been 

 extracted under the immediate superintendence of the Royal Society. 



b 2 



