ESTTEODUOTIOK TO VOLUME IV 



VOLUME IV. of the Bradley Bibliography is intended to contain the titles of all publications 

 relating to forestry and silviculture, including the more important articles published in 

 periodicals and other serials. To collect these articles the principal forestry periodicals have 

 been completely excerpted, and papers relating to forestry have been extracted from agricultural, 

 horticultural and botanical periodicals, and from serial publications of a general character. 



The libraries which have been examined by the compiler are mentioned in the introduction to 

 volume i. In addition to the list of foreign assistants enumerated in that volume our thanks are due 

 to P. Bertholet, of Lausanne, by whom the Swiss and Italian forestry periodicals and in part the 

 Spanish forestry periodicals have been excerpted, to K. Eppner of Munich and to Dr. Harrer of 

 Vienna, who have excerpted several of the German and Austrian forestry periodicals. Unfortu- 

 nately lack of time has prevented Mr. E. Wolf of St. Petersburg, who has compiled the Russian 

 forestry literature for the Bibliography, from excerpting the Russian periodicals devoted to this 

 subject; and we have been unable to find in Sweden an assistant able to excerpt articles on forestry 

 from the periodicals of that country. 



Following the dendrological part of the Bibliography and to avoid the repetition of many titles 

 the publications dealing with a certain family, genus or species are entered under their respective 

 divisions in the taxonomic arrangement. Thus a paper dealing with an insect disease of the Norway 

 Spruce will be found under Picea Abies, subdivision Diseases, and not under Diseases caused by 

 Insects ; a paper dealing with the yield of the White Pine will be found under Pirnis Strobus, subdi- 

 vision Forest Management, and not under Determination of Yield or under Volume Tables. 



In the taxonomic arrangement the nomenclature, sequence of families and limitation of genera 

 are the same as in volume ii. 



Additional references to families, genera and species which are not strictly silvicultural or 

 forestal may be found in volume ii. and in the taxonomic part of volume iii. ; additional references 

 to general descriptive botany, to morphology and anatomy, to physiology, ecology, evolution, etc., 

 in volume L, and to cultivation, diseases and economic products in volume iii. 



