X 11 EXPLANATIONS. 



The indented entries in smaller type are abstracts, but a 

 selection only of those which appeared likely to be useful. Thus, 

 except in the case of abstracts of unusual importance, they 

 are confined to those in a different language or published in 

 a different country from that in which the original memoir or 

 a translation of it had appeared. 



When more than one edition of a work is cited they are either 

 the first and the last accessible to me, or those which differ 

 most greatly or appear to be the best. When the difference 

 is very slight, an edition is sometimes cited in type still 

 smaller than that of the abstracts, and the same type is used 

 for occasional remarks on the works. 



The number of pages, etc., of independent publications is 

 only given when it is so small that they may be considered 

 pamphlets. 



The abbreviations of the titles of periodical publications 

 and other works are such as will be generally understood, but 

 the titles of all journals and proceedings of Societies cited are 

 given at the end of the volume, either in full or sufficiently 

 so for certain identification, with their size (mostly 8) 

 and place of publication. Words or parts of words in paren- 

 theses indicate either that the title varies, or an occasional 

 variation in the abbreviation for it. 



