
          hoped that experimenters will at all times exercise care to preserve the 
original labels sent with the plants, or accurate plats showing the location 
and S.P.I. number of each one.

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 information 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 concerning them. Such inquiries involve much unnecessary labor 
and expense.
        