INTRODUCTION. 



THIS Subject Catalogue contains the titles of about one- 

 third of the books in the new Science Library, Marischal 

 College being those placed on the open shelves in the 

 Students' Heading Koom, the Professors' Beading Koom and 

 the Magazine Koom. The remaining two-thirds, shelved 

 in the Stack Rooms, are titled either in the author catalogues 

 printed in 1874 and 1897, or in the manuscript sheaf cata- 

 logues (both of authors and of subjects), which may be 

 consulted in the Library. 



To keep the booklet of a convenient size, the titles have 

 been cat down as far as is consistent with clearness. Authors' 

 pre-naines are entered as initials only, while the names of 

 editors and of translators are omitted, save in exceptional 

 cases. No cross-references are given from the names of 

 joint authors, and books of composite authorship have not 

 been analysed. 



The system of classification and notation here employed 

 is a modification of that devised by Mr. Melvil Dewey, which 

 is in use in many libraries in all parts of the world. Certain 

 alterations have been introduced, suggested by the publica- 

 tions of the Institut International de Bibliographic of 

 Brussels, and the whole has been adapted to the special 

 requirements of a University Library. 



It is impossible to devise a classification that will satisfy 

 every one ; but it must be borne in mind that a classification 

 of actual books is a different thing from a classification of 



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