
          
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 he 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.

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.
        