It will be necessary for experimenters to preserve and refer to the Annual 

 List of Plant Introductions, or to the Inventories published by the Office, for in- 

 formation regarding the plants. Each Inventory lists the seeds and plants imported 

 during a period of three months. Its object is to serve as an historical record; it 

 is not printed immediately following the arrival of the plants, but eighteen to 

 twenty-four months later. The edition is limited, and it cannot be supplied to all 

 experimenters. This makes essential the preservation of the Annual List as a work 

 of reference, and the Office desires to urge upon its cooperators the importance of 

 this step. Unless the Annual lists are preserved, the Office will be flooded with 

 inquiries from people who have received plants, and who desire information concern- 

 ing them. Such inquiries involve much unnecessary labor and expense. 



For conveniencs in using the Annual List, after each description is given, in 

 parenthesis, the name of the Garden from which the plants will be sent. 



