In arranging the alphabetical order of Authors' names, the practice of the respec- 

 tive countries has been followed as far as possible, and hence the following rules 

 have been adopted : 



1. The prefixes, D', Da, Dal, DC, Del, Delia, T'au, Ton, arc not considered 

 as part of the name, thus De Cagnoli will be found under Cagnoli, Da Costa 

 under Costa, Van Beneden under Beneden, etc. To avoid confusion the Flemish 

 article De is treated in like manner. English names, such as DC Morgan, De la 

 Beche, Van Mildert, are to be excepted, the prefixes having no signification in our 

 language. 



2. Names preceded by Dir, Des, Mac, and O' will be found under the letters D, M, 

 and O. 



3. Names preceded by Lc, La, or Les, will be found under the letter L. 



Where a rigorous adherence to these rules would have caused confusion, a cross 

 reference directs the reader to the place where the Author's papers are to be found : 

 thus the papers of D'Arcet, De Candolle, and De la Rive, are placed under D, and 

 cross references are given under A, C, and L. 



4. In English and Dutch compound names, the last name is preferred ; in Erench, 

 Spanish, and Portuguese, the first. 



No pains have been spared to assign the Memoirs to their respective Authors ; but 

 it is possible there may be some confusion, when there are two persons of the same 

 name, arising from the absence, in many cases, of Christian names, or even the 

 initials of Christian names, or other distinctive marks, to guide the Compilers of the 

 Catalogue.* 



5. When writers have been known by more than one name, as in the case of 

 persons who have changed their names, who have been ennobled, or who have been 

 raised in the peerage, their Papers will be found all together under their last name 

 or title, cross references alone being given after their earlier names or titles. 



G. Pseudonyms will be found under their proper letter; but the Papers have 

 been indexed under the Author's real name, when it could be discovered. 



* None but those who have been engaged in a task of this kind can form any idea of the difficulty 

 occasioned by such omissions. It is hoped that this notice may have some effect in inducing contributor? 

 to Scientific Journals to give their names in full. 



