INFORMATION CONCERNING BOTANICAL ABSTRACTS. Continued 



abstracting will be maintained in the oflSce of the Bibliography Committee. Readers are 

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

 publications that are not being properly represented in Botanical Abstracts. The chair- 

 man of the Committee for 1921 is J. R. Schramm, Cornell University, Ithaca, New York. 



Collaborators of Botanical 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 constitutes the 

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

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

 is published once a year in Botanical Abstracts. It is desirable that a considerable reserve 

 list of collaborators be maintained, in order to allow for necessary changes, and additional 

 collaborators are therefore earnestly solicited. 



Abstractors for Botanical Abstracts. Collaborators frequently prepare abstracts 

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

 Every abstract is signed by the Abstractor who prepares it, but entries by citation alone are 

 not signed. The Collaborators are responsible for these citations. There are many volun- 

 tary contributors to the enterprise besides 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. 



Readers of Botanical Abstracts are earnestly requested to make careful note of any 

 errors that occur in the journal, with their corrections, and to send these notes to the Editor- 

 in-Chief. If all will cooperate in this it will be possible to supply a page of corrigenda with 

 each volume. 



Botanical Abstracts is published monthly. Each volume contains about 300 pages. 

 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. 



Price per volume, net, postpaid: $3.00, United States and dependencies; $3.12, Canada; 

 $3.25, other countries. The current volumes are IX and X. Foreign subscriptions to the 

 current volume accepted at par of exchange. Back volumes, Volumes III to VIII, inclusive, 

 can be supplied. Volumes I and II are out of print. Foreign subscriptions to the back volumes 

 accepted at the current rate of exchange. 



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



United States of North America and dependencies; Mexico; Cuba: Williams &Wilkins 

 Company, Publishers of Scientific Journals and Books, Mount Royal and Guilford Avenues, 

 Baltimore. 



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



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



Belgium: Henri Lamertin, 58 Rue Coudenberg, Bruxelles. 



The British Empire, except Australia and Canada: Order from any British bookseller or 

 order direct from the Publishers. 



Canada: Wm. Dawson & Sons, Ltd., 87 Queen Street, East Toronto. 



Denmark: H. Hagerup's Boghandel, Gothersgade 30, KjSbenhavn. 



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



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



Holland: Scheltema & Holkema, Rokin 74-76, Amsterdam. 



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

 baski Tori-Sanchome, Tokyo; Fukuoka, Osaka, Kyoto, and Sendai, Japan. 



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



