[ iv ] 



tlirec exceptions necessary to prevent confusion) that adopted generally in Library 

 Catalogues. The List of Abbreviations, being supplementary to that prefixed to 

 the First Volume, contains only the titles of new works, and of those in which the 

 reference has been modified. 



The President and Council of the Eoyal Society offer their best thanks to the 

 authorities of the British Museum, Patent Office, Koyal School of Mines, Royal 

 College of Surgeons of England, Medical and Chu'urgical, Geological, Zoological, 

 Linnean, Chemical, and other Societies, for the readiness with which access to their 

 libraries has been afforded during the preparation of the Catalogue. 



They further take this opportunity of expressing their gratitude to the eminent 

 Men of Science who, in addition to their services on the Catalogue Committee, have, 

 at the cost of much valuable time, undertaken to read the proof sheets. 



And, finally, they desire to acknowledge the valuable services of Mr. Henry 

 White, who has superintended the compilation and printing of the Catalogue 

 from its commencement. 



