664 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1917. 



In 1888 he was also appointed an assistant geologist on the United 

 States Geological Survey and detailed for work on the Cretaceous 

 and Tertiary formations of the Atlantic Coastal Plain. At the same 

 time he was requested to prepare the correlation bulletin on the 

 Eocene, one of a series of reports which were presented to the Inter- 

 national Geological Congress in Washington in 1891. Professor 

 Clark spent the summer of 1889 in a study of the Eocene deposits of 

 the far West, while the remaining period was occupied in the investi- 

 gation of the Eocene formations of the Atlantic border. He was 

 advanced to geologist on the staff of the United States Geological 

 Survey in 1894 and held this position until 1907, since which time 

 he has acted as cooperating geologist. 



Professor Clark organized the Maryland State Weather Service 

 in 1892, of which he was appointed the director and held the po- 

 sition continuously until his death. In 1896 he organized the Mary- 

 land Geological Survey, and had been State geologist since the 

 establishment of that bureau. The geological survey was enlarged in 

 scope in 1898 by the addition of a highway division, which was in- 

 structed to investigate and report on the conditions of the roads of 

 the State and the best means for their improvement, and Professor 

 Clark and his associates through their publications and addresses 

 aroused much interest in the subject throughout the State. In 1904 

 the duties of the highway division were much increased by the 

 appropriation of $200,000 annually, to be met by a similar amount 

 from the counties, for the building of State-aid roads by the survey. 

 A sum exceeding $200,000 was also subsequently appropriated for the 

 building, at the expense of the State alone, of a highway connecting 

 Baltimore and Washington. The duties of the highway division 

 were transferred in 1910 to a newly organized State roads commis- 

 sion, of which Professor Clark was made a member and which posi- 

 tion he held until 1914. Nearly $2,000,000 had been expended, 

 however, by the State geological survey in the supervision and build- 

 ing of roads up to the date of the transfer. 

 Under an act of the legislature passed in 1900 Professor Clark was 

 appointed commissioner for Maryland by the governor to represent 

 the State in the resurvey of the Maryland-Pennsylvania boundary, 

 commonly known as the Mason and Dixon line. This survey was 

 completed four years later and an elaborate report prepared. In 

 1906 he was made a member of the Maryland State Board of For- 

 estry, and elected as its executive officer, which position he held at 

 the time of his death. The governor appointed him in 1908 a mem- 

 ber of the State conservation commission. 



Professor Clark organized and directed the preparation of the offi- 

 cial State exhibits of Maryland mineral resources at the Buffalo, 

 Charleston, St. Louis, Jamestown, and San Francisco expositions in 



