PREFACE. 



The Lloyd Library is devoted almost exclusively to Botany, 

 Materia Medica, and Pharmacy, with a section of Eclectic Medicine' 

 It contains at this time 39,607 volumes, which is possibly the 

 most extensive collection of books and periodicals directly per- 

 taining to these subjects. The pamphlets, of which there are many 

 thousands, are systematically arranged by authors. From twenty- 

 five to fifty of them are placed in a cover, and each cover is counted 

 as one volume. 



In the Lloyd Library there has been compiled a catalogue of the 

 various books and their editions, pertaining to our subjects sys- 

 tematically arranged by authors. This catalogue has been made 

 from all available sources, such as Jackson's "Guide to the Litera- 

 ture of Botany," Pritzel's "Thesaurus Literaturae Botanicae " 

 Botanische Centralblatt," "Index Catalogue of the Library of the 

 Surgeon General's Office," and book notices in various journals 

 and Its compilation has been a work requiring several years of labor' 

 It is systematically kept up to date, the new entries being made 

 as the books appear. This catalogue is typewritten on what is 

 known as the loose-leaf ledger system, so that the sheets can be 

 taken out and the entries made in their proper place and new sheets 

 inserted. It is probably the most complete bibliography of the 

 subjects that has ever been brought together. 



In order that the work in our library on this catalogue may 

 be available to others, we have been for the past three years issuing 

 bibliographies of the various sections of the library, taken from our 

 catalogue. The books now in our library have been indicated by 

 the shelf numbers printed in heavy-faced type, and the pamphlets 

 by a star. 



The first issue of Bibliographical Contributions, Volume i 

 was devoted to the periodical literature which our library contained 

 at that time, January, 191 1. The present number, which forms the 

 first issue of Volume 2, is also a catalogue of our periodical litera- 

 ture, corrected and revised to date. A comparison of this number 

 with the former list will show quite a large increase in this de- 

 partment. 



