INTRODUCTION 



THE Bradley Bibliography is intended to contain the titles of all publications relating wholly 

 or in part to woody plants, including books, pamphlets, and articles in periodicals and other 

 serials in all languages published up to the end of 1900. The term woody plant as here un- 

 derstood excludes suffruticose species, although publications relating to these plants have usually 

 been admitted when they belong to a family, as Ericaceae, where the percentage of such plants is 

 small. For the same reason publications relating to the stemless species of the families Cyclantha- 

 ceae and Cycadaceae are not excluded, as the majority of plants in these families are caulescent, 

 while the stemless species of Agave and Strelitzia have been omitted, as in these genera stem-pro- 

 ducing species are the exception. Publications on all species of Cactaceae are included, even if many 

 of these are not more woody than some members of the Orchidaceae and Araceae; of both of these, 

 however, the literature has been entirely excluded from the Bibliography, although in the latter 

 family species exist which may be considered shrubby. It has been deemed necessary, also, to ex- 

 clude the literature of the Pteridophytes and all publications on fossil plants, in order to keep the 

 work within reasonable limits. 



Titles are arranged systematically according to subjects, and under each separate subject they 

 are arranged chronologically, except in the case of periodicals, where an alphabetical arrangement 

 appears more practical. To make the chronological sequence of publications easily seen the dates 

 are printed in heavy type, except those of later editions, which follow immediately after the entry of 

 the first edition. Translations follow the original in the same paragraph in their respective chron- 

 ological order. 



The Bibliography will be published in five volumes. The first volume includes all botanical pub- 

 lications containing references to woody plants except those which are restricted to a particular 

 family, genus or species, which are found in the second volume and are arranged according to the 

 system of Engler & Prantl. By this arrangement all the publications on a particular family, on a 

 particular genus or on a particular species will be found together in chronological sequence; and in 

 the case of large genera with an extensive literature, like Pinus or Quercus for example, the entries 

 are arranged chronologically under several headings, those relating to taxonomy under the differ- 

 ent countries where the family or genus occurs. 



The third volume contains the titles of publications dealing with the economic products and uses 

 of woody plants, and with arboriculture, including the ornamental values and uses of trees and 

 shrubs. The fourth volume is devoted to forestry. 



The fifth volume contains an index to all titles enumerated in these four volumes, arranged 

 alphabetically according to authors and titles. 



Titles are printed in their original form, but titles of publications printed in foreign characters 

 other than Russian, Servian and Greek have been transliterated. All titles in other than Romanic 

 and Germanic languages, and also Greek titles, are followed by an English translation, except in 

 those cases where a translation into a Romanic or Germanic language has been published. The 

 titles are printed as fully as possible, and only the unimportant parts of long titles have been 

 omitted. Omitted parts of titles are always indicated by three dots (...). Supplied words nec- 

 essary to a better understanding of the title are included in brackets. 



The size of the books entered is given according to the measurements adopted in must American 

 libraries. For the actual sizes represented by the symbols used see the Explanat ion of Signs and Ab- 

 breviations on page my. This does not apply to books which have not been seen by the compiler, 

 and which are marked with a dagger (f). 



Periodicals and other serial publications have been completely excerpted when they have been 

 found to contain numerous important articles bearing on the subjects included in the Bibliography, 



