INFORMATION CONCERNING BOTANICAL ABSTRACTS, Continued 



abstracts of all botanical papers in a specified serial publication, or in a limited number of 

 serials. The Committee is further charged with the duty of maintaining an accurate record, 

 through a system of reports furnished currently by the Collaborators, of the state of abstract- 

 ing for each serial publication. This record enables the Committee to detect and correct 

 delinquencies in the work of abstracting and to keep the work up to date. The number of 

 assigned serials will eventually exceed 2000, for each of which a record of the state of ab- 

 stracting will be maintained in the office of the Bibliography Committee. Readers are earnestly 

 requested to aid the Bibliography Committee by bringing to its attention any serial publi- 

 cations that are not being properly represented in Botanical Abstracts. The chairman of 

 the Committee for 1920 is J. R. Schramm, Cornell University, Ithaca, New York. 



Collaborators of Botaxical Abstracts. A large number of botanical workers in all 

 parts of the world have volunteered to assume complete responsibility for securing citations 

 and abstracts from one or more serial publications as assigned to them by the Bibliography 

 Committee. This corps of voluntary workers (called Collaborators) really constitute the basis 

 of the service rendered by Botanical Abstracts. Through their work it is made certain 

 that all serial publications are promptly entered. A list of the names of Collaborators is 

 published in each volume of Botanical Abstracts. It is desirable that a considerable 

 reserve list of collaborators be maintained, in order to allow for necessary changes, and addi- 

 tional collaborators are therefore earnestly solicited. 



Abstractors for Botanical Abstracts. Collaborators frequently prepare abstracts them- 

 selves, and are thus Abstractors, but they also arrange for others to prepare them. Every 

 abstract is signed by the Abstractor who prepared it, but entries by citation alone are not 

 signed. The Collaborators are responsible for these citations. A list of Abstractors is pub- 

 lished for each volume of Botanical Abstracts. It includes many names of voluntary 

 contributors to the enterprise, besides those of the Collaborators. 



The Printing and Circulation of Botanical Abstracts is in the hands of the Publishers, 

 according to the terms of a definite contract between them and the Board of Control. All 

 other matters are directly in the hands of the Board of Control. Correspondence concerning 

 subscriptions should be addressed to the Publishers or their agents; other matters should be 

 referred to the Chairman of the Board of Control, to the Chairman of the Bibliography Com- 

 mittee, or to the Editor-in-Chief. 



Botanical Abstracts is published monthly, two volumes being issued each year. Each 

 volume contains about 300 pages. The current (1920) volumes are III and IV. The price 

 for the two volumes is $6 for the United States and its dependencies, Mexico and Cuba; 

 $6.25 for Canada; $6.50 for other countries. (Volumes I and II can no longer be furnished by 

 the publishers.) No claims are allowed for copies lost in the mails unless such claims are 

 received within 30 days (90 days for places outside of the United States and Canada) of 

 the date of issue. 



Subscriptions are received at the following addresses, for the respective countries: 



United States of North America and dependencies: Williams & Wilkins Company, Mount 

 Royal and Guilford Avenues, Baltimore. 



Argentina and Uruguay: Beutelspacher y Cia., Sarmiento 815, Buenos Aires. 



Australia : Stirling ct Co., 317 Collins St., Melbourne. 



Belgium: Henri Lamertin, 58 Rue Coudenberg, Bruxelles. 



The British Empire, except Australia and Canada: The Cambridge University Press, 

 C. F. Clay, Manager, Fetter Lane, London, E. C. British subscribers are requested to make 

 checks and money orders payable to Mr. C. F. Clay, Manager, at the London Address. 



Canada : Win. Dawson <fc Sons. Ltd., 87 Queen Street, East Toronto. 



Denmark: H. Hagerup's Boghandcl. Gothersgade 30, Kjobenhavn. 



France: Einile Bougault, 48, Rue des Ecoles, Paris. 



Germany: R. Friedlander & Sohn, Carlstrasse 11, Berlin N. W., 6. 



Holland: Scheltema & Holkema, Rokin 74-74, Amsterdam. 



Italy: Ulrico Hoepli, Milano. 



Japan and Korea: Maruzen Company, Ltd. (Maruzen-Kabushiki-Kaisha), 11-16 

 Nihonbashi Tori-Sancbome, Tokyo; Fukuoka, Osaka, Kyoto, and Sendai, Japan. 



Spain: Ruiz Hermanos, Plaza de Santa Ana 13, Madrid. 



Switzerland: Georg «fc Cie., Freistrasse 10, B&le. 



