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PREFACE

Many titles in this list are accompanied by citations of
biographical and bibliographical data, and critical notes by the compilers.

A large proportion of the entries were collected, and many of them
annotated by Miss Warner before her retirement from the Bureau of Plant
Industry in 1934, after which she continued to actively work on the list
and generally supervised its progress until its completion in 1939. Miss
Brown was in charge of editing and production from 1934 onwards.

Inedited entries for some sections of the list, omitted from the
looseleaf form, are kept on cards for reference or for future inclusion
in the list.

Three copies were made of this MS. This copy contains, immediately
following the preface in the first volume, a Critical Report on the Check
List, prepared by Miss Warner in September 1945.
        