EXPLANATORY NOTE 



I. For economy in publication, titles have been simplified; certain 

 words and punctuation marks have been omitted where they appeared 

 unnecessary for a clear understanding of the references. 



II. Rules of the American Library Association have been followed 

 as to (1) alphabetizing, and (2) transliteration 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 Etat, etc., and Danish and Norwegian nouns are not 

 capitalized. 



III. Additions to titles or inserted explanatory phrases are included 

 in inferior brackets [ J, parentheses being retained where they occur 

 in titles. 



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

 diately succeeding the numerals denoting year of publication. 



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

 phabetically as to publications within the same year. 



VI. Where titles have been taken from standard works of reference 

 (e. g., British Museum Library Catalogue and the bibliographies of 

 Agassiz, Bosgoed, Carus and Engelmann, etc.) the numbers for pages 

 and volume have not as a rule been verified. 



