IMPORTANT NOTICE TO SUBSCRIB- 

 ERS FOR BOTANICAL ABSTRACTS 



FOUR VOLUMES FOR 1920 



Since the systematic collection of citations and abstracts for Botanic m. 

 Abstracts (by the Bibliography Committee, the collaborators and the 

 Abstractors) has now been perfected to such an extent that almost all of 

 the world literature in this field is now being currently cared for, it is pos- 

 sible to revise the original preliminary plans for the journal at this time. 

 The text pages for volumes I and II were published for 1919, but these 

 two volumes do not include the total of GOO pages called for. Much of the 

 material really belonging in volumes I and II has appeared, or is about to 

 appear, in 1920, and it is now clear that a total of six volumes (averaging 

 300 text pages each) will be required to publish the entries from the beginning 

 through December, 1920. 



The deficit in text pages for volumes I and II has been made up by the 

 text of volume III. It is now planned to publish the material as rapidly 

 as it is collected, in monthly installments, and to make no attempt to fur- 

 nish any stated number of volumes per year, each volume containing at least 

 300 pages. The number of volumes to appear in any year will be deter- 

 mined simply by the amount of literature to be cared for. 



The issue for July, 1920, constitutes the text for the whole of volume IV and 

 with it subscribers receive the preliminary and author-index pages for vol- 

 ume II. The text of volume IV contains more entries and more pages than 

 do the whole six issues of volume I. 



The August and September issues, 1920, which are now in press, icill con- 

 stitute volume V, and it seems probable that volume 1 ' 1 wiU contain thn e issues, 

 for October, November and December, 1920. 



These new plans will secure for subscribers the prompt receipt of ab- 

 stracts, which is highly desirable. About ninety per cent of all journals 

 containing articles on plant life are now being abstracted, and the work 

 of collecting and editing the abstracts is moving forward in a very satisfac- 

 tory manner. It is hoped that the number of subscribers to Botanii al 

 Abstracts will soon be sufficientl}- increased so that the original pric< s may 

 be continued, in spite of the very high cost of printing ami papt r. It is inter- 

 esting to note that Botanical Abstracts is now supplied to subscribers at 



