EXPLANATORY NOTE 



I. For economy in publication, titles have been siimplified; words 

 and punctuation marks have been omitted where they appeared un- 

 necessary for a clear understanding of references. 



II. Rules of the American Library Association have been followed 

 as to (1) alphabetizing, and (2) transUteration of Slavonic names, 

 with vowels as in Italian and consonants as in English. In addition, 

 initial capitals in foreign languages are unaccented, as for instance 

 Abo for Abo, Etat for fitat, etc., and Danish and Norwegian nouns 

 are not capitalized. 



III. Additions to titles or inserted explanatory phrases are in- 

 cluded in inferior brackets i i, parentheses being retained where they 

 occur in titles. 



IV. The number of the volume is printed in bold-faced type, im- 

 mediately succeeding the numerals denoting year of publication. 



V. Authors' titles are arranged chronologically as to years and 

 alphabetically as to publications within the same year. 



VI. Where titles have been taken from standard works of refer- 

 ence (e. g., British Museum Library Catalogue and the bibliogra- 

 phies of Agassiz, Bosgoed, Carus, and Englemann, etc.) the numbers 

 for pages and volume have not as a rule been verified. 



