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 later will be flooded 
with inquiries from people who have received plants, and who desire information con- 
cerning them. Such inquiries involve much unnecessary labor and expense. 
For convenience in using the Annual List, after each description is given, in 
parenthesis, the name of the Garden from which the plants will be sent. 
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