6 CATALOGUE OF BOTANICAL LITERATUKE, 



the individual States. Towns, cities, counties, etc., appear under 

 their respective States, as in the case of Germany. In the same man- 

 ner as the United States are arranged Great Britain, Canada, West 

 Indies, Chinese Empire, Australia, and other similar divisions. 



Some of the other large subjects are also subdivided, as " Mate- 

 ria medica," by countries; "Plant names," by languages; "Plant 

 anatomy" and "Plant morphology," by names of families; "Plant 

 nutrition." by names of plant foods used ; "Alkaloids in plants," by 

 names of the individual alkaloids. Examples might be multiplied 

 indefinitely. 



GUIDES. 



To facilitate the use of the subject catalogue a special system of 

 guide cards has been adopted. Blue guide cards are used for main 

 subjects standing in regular alphabetical order and but!' guide cards 

 for subdivisions of subjects. It will, of course, be understood that 

 guides are not supplied for every subject, only the more important 

 being so indicated. The systematic headings can be readily distin- 

 guished, as all names of genera are in red, while all other headings 

 are in black. 



EDITIONS AND TRANSLATIONS. 



Cards are not multiplied for editions and translations in the sub- 

 ject catalogue. A card for the original or earliest edition is inserted, 

 with a not'e referring to the author catalogue for other editions and 

 translations. The only exception to this rule is in cases Avhere the 

 recent edition is the most important, as is the case with textbooks 

 and reference books. In such an instance the card for the latest 

 edition is filed, with a note referring to the author catalogue for 

 earlier editions. 



BELATION OF THE BOTANY CATALOGUE TO THE PLANT- 

 INDUSTRY CATALOGUE. 



When the Botany Catalogue was installed in the Bureau of Plant 

 Industry library it soon became evident that there was some un- 

 necessary duplication in the subject catalogues of the Plant-Industry 

 Catalogue and the Botanv Catalogue. It was then decided to cut out 

 of the Botanv Catalogue the suljject of phuit pathology with its 

 allied subjects, which is so fully and carefully treated in the Plant- 

 Industry Catalogue; in the same manner were treated such subjects 

 as sugar cane, sutrar beet, sugar-producing plants, and nitrification. 

 The Plant-Industry Catalogue turned over to the Botany Catalogue 

 all subjects dealing with systematic botany, plant life histoiw, general 

 horticulture, and such special crops as the Botany Catalogue had 

 already treated more or less fully. Cross references in the subject 

 catalogue refer to the headings used in the Plant-Industry Catalogue. 

 The li'iie of demarcation between the Plant-Industry Subject Cata- 

 lojTiie and the Botanv Subject Catalogue may not seem to have l)een 

 dniwn very logically, but it is the result of the varying use of the 



[Cir. 87] 



