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. 
Il. 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, ete., and Danish and Norwegian nouns are not 
capitalized. 
III. Additions to titles or inserted explanatory phrases are included 
in inferior brackets | 1, 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. 
