18 PREFACE

P. R. Uhler, the Provost of Peabody Institute, regarding all lines of
scientific research in Maryland, as well as his personal acquaintance
with many of the men who were influential in the earlier days, has
been of much service to the author.

The Outline of Present Knowledge of the Physical Features of
Maryland, which follows and which forms Part III of the report,
has been compiled from existing data, and is based upon the chapters
prepared, for the most part, jointly by the late Professor Williams
and the author, for the volume " Maryland, its Resources, Industries
and Institutions, " which was published by the Board of World's Fair
Managers of Maryland in 1893. During the years since this work
appeared a reconnaissance survey has been made of the entire state,
while certain areas then unknown have been subjected to special
study, which admits of a more comprehensive treatment of the subject
than was then possible. The later investigations of the writer assisted
by Dr. R. M. Bagg, Mr. A. Bibbins and Mr. George B. Shattuck in
the Coastal Plain; those of Mr. Arthur Keith and Dr. E. B. Mathews
in the Piedmont Plateau; those of Mr. Bailey Willis, Dr. A. c.
Spencer and Mr. C. G. O'Harra in the Appalachian Region; and those
of Mr. Cleveland Abbe, Jr., upon the physiography of the state, have
added much to existing knowledge.. The results of this later work
will be incorporated in the present chapter, although earlier methods
of treatment and even the phraseology will be retained wherever pos-
sible. Abstracts have been made, directly from the writings of Wil-
liams, Willis, Keith, Darton, and others without further recognition
than that here given.

The Bibliography and Cartography of Maryland, which forms Part
IV of the report, and which has been prepared mainly by Dr. E. B.
Mathews, has been shared in by all the members of the survey and
represents an exhaustive search of all works which might be consid-
ered to throw light upon the physical features, including the physio-
graphy, geology and mineral resources of the state. The aim during
this compilation has been to bring together such papers and maps as
will be helpful to workers on the problems presented by the physical
features of Maryland. With this aim in view, references have been