The prime purpose of Botanical Abstracts is to supply citations and abstracts of all 

 papers dealing with botanical subjects, wherever published, ju.st M soon as possible after 

 they appear. Every effort will be made to present complete and correct citations of all 

 papers appearing later than January 1, 1918. As an adequate index of progress, Botanical 

 Abstracts should be of use to the intelligent grower, field agent and inspector, extension 

 worker, teacher and investigator. The international scope of this work should appear 

 especially to workers having restricted library facilities. The classification by subjects 

 should prove a great aid even to those having access to largo libraries. 



The Board of Control of Botanical Abstracts, Inc. — Donald Reddick, Chairman — 

 has charge of the publication. The membership of the Board of Control is representative of 

 the various American botanical societies. Each society is represented by two members, one 

 elected for a period of two years and the other for a period of four years. Each society elects 

 a member for a period of four years, at intervals of two years, to replace its representative 

 who automatically retires. The Editorial Board of Botanical Abstracts is appointed 

 annually by the Executive Committee of the Board of Control. The Bibliographical Com- 

 mittee of Botanical Abstracts, which has charge of the securing of abstracts for the exten- 

 sive field of periodical literature, is appointed annually by the Board of Control. Themem- 

 1'ers of the Board of Control, the Editorial Board and the Bibliographical Committee have 

 given their services free for 1919. 



The Executive Committee of the Board of Control of Botanical Abstracts has charge of 

 ad interim affairs not involving matters of general policy. This Committee consists of the 

 following members for 1919: R. A. Harper, Columbia University. B. E. Livingston, The 

 Johns Hopkins University. Geo. E. Nichols, Yale University. Donald Reddick, Chair- 

 man, Cornell University. C. L. Shear, U. S. Department of Agriculture. 



North American Botanical Organizations Represented on the Board of Control of Botan- 

 ical Abstracts: American Association for the Advancement of Science, Section G, Botany. 

 American Genetic Association. American Microscopical Society. American Phytopatho- 

 logical Society. American Society of Agronomy. American Society of Naturalists. American 

 Conference of Pharmaceutical Faculties. Botanical Society of America: General Section, 

 Physiological Section, Taxonomic Section. Ecological Society of America. Paleontological 

 Society of America. Society for Horticultural Science. Society of American Foresters. 



The Bibliographical Committee of Botanical Abstracts — J. R. Schramm, Chairman 

 (Ithaca, N. Y.) — assigns the journals and other periodical publications to collaborators, 

 who secure the required citations and abstracts. The names of the collaborators will be 

 published for each volume of Botanical Abstracts. The Committee systematically follows 

 the periodicals on its list and makes certain that all are promptly cared for, as their issues 

 appear. All readers are earnestly requested to aid the Bibliographical Committee by bring- 

 ing to its attention any periodical publications that are not being abstracted. The Com- 

 mittee also solicits additional collaborators. 



Botanical Abstracts is published monthly, beginning September, 1918. Two volumes a year 

 are issued. Each volume contains about 300 pages. 



Current 1920 Volumes: III and IV. Back volumes cannot be supplied. 



Price for the two volumes a year, $6.00 United States, Mexco, Cuba; $6.25 Canada; $6.50 



other countries; net postpaid. 



Subscriptions are received at the following addresses: 



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



For Belgium: Henri Lamertin, 58 Rue Coudenberg, Bruxelles. 



For 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. 



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



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



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