PREFACE TO VOL. VI. 



THE contents and arrangement of this Volume, which brings the labour of 

 fourteen years to an end, seem to require a word of explanation. 



Under the heading " Anonymous " are included all those titles whose authors 

 could not be identified after a careful examination of the original works in the 

 Library of the Royal Society. Such titles as could be identified have been 

 assigned to their respective authors, and are distinguished by the word [Anou.] 

 to indicate the absence of the writer's name in the work from which they were 

 copied. The difficulty of arranging a large number of anonymous articles has 

 been met by placing them alphabetically, according to the titles of the books 

 in which they are found, as in the List of Abbreviations prefixed to Vol. I. 



Under " Additions " are included Corrections as well as new titles from 

 works indexed during the progress of the Catalogue through the press. Care 

 has been taken to exclude titles already printed in the earlier portion of the 

 work, but the references have been preserved, and simple instructions are given 

 where to place them. The consecutive figures attached to titles signed with 

 "initials" only, do not necessarily imply identity of authorship; they are 

 intended to facilitate reference in the Index of Subjects now in preparation. In 

 some cases the baptismal names of the authors are given in full, while in the 

 former volumes there may have been initials only. The consecutive numbering 

 will, however, prevent any confusion of identity. 



The complete list of works catalogued since the publication of Vol. I. will 

 save the trouble of referring to several volumes. A reference not found here 

 will be found, of course, in the first list. Many of the deficiencies noted in 



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