LETTER OF TRANSMITTAL

TO HIS EXCELLENCY EMERSON C. HARRINGTON,

Governor of Maryland and President of the Geological Survey Commission.

Sir: I have the honor to present herewith the tenth of the general reports of the Maryland Geological Survey which contains the results of extensive studies on two subjects of the widest interest and greatest importance to the people of the State. The detailed investigations and part of the writing of the report were conducted under the direction of the late Dr. Wm. Bullock Clark, but the final work of the investigations and the completion of the manuscripts were carried on after his death. The State of Maryland has received much from Dr. Clark's participation in its activities, and it is eminently fitting that this volume should include a summary statement of the vast amount of information accumulated through his energy and administrative ability. I am,

Yours very respectfully,

EDWARD BENNETT MATHEWS,

JOHNS HOPKINS UNIVERSITY,

BALTIMORE, February 16, 1918.

State Geologist.