August 3, 1917] 



SCIENCE 



105 



expended, however, by the State Geological 

 Survey in the supervision and building of 

 roads up to the date of the transfer. 



Under an Act of the Legislature passed in 

 1900 Professor Clarke was appointed com- 

 missioner 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 Forestry and elected as its executive officer, 

 which position he held at the time of his 

 death. The governor appointed him in 1908 

 a member of the State Conservation Com- 

 mission. 



Professor Clarke organized and directed the 

 preparation of the official st-ate exhibits of 

 Maryland mineral resources at the Buffalo, 

 Charleston, St. Louis, Jamestown, and San 

 Francisco expositions in 1901, 1902, 1904, 

 190Y, and 1915. ■ These exhibits : attracted 

 much attention at the time and received a 

 large number of conspicuous awards. These 

 exhibits have been permanently installed as a 

 state mineral exhibit at the state house in 

 AnnajKilis. 



"When President Eoosevelt invited the gov- 

 ernors of the states to a conference on con- 

 servation at the White House in May, 1908, 

 it was arranged that each governor should 

 appoint three advisers to accompany him. 

 Professor Clark was one of the Maryland ad- 

 visers and took part in the conference. 



After the great Baltimore fire in 1904 the 

 mayor of the city appointed Professor Clarke 

 a member of an emergency committee to pre- 

 pare plans for the rehabilitation of the burnt 

 district and for several months he served as 

 vice-chairman of the important subcommittee 

 on streets, parks, and docks whose plans re- 

 sulted in the great changes subsequently 

 carried out. The following year he was ap- 

 pointed by the mayor a member of a com- 

 mittee to devise a plan for a sewerage system 

 for the city which has resulted in the build- 

 ing of the present modem system of sewers. 

 Again in 1909 the mayor also appointed him 



a member of a committee for devising a plan 

 for the development of a civic center for 

 Baltimore. 



Since 1901 Professor Clark has been presi- 

 dent of the Henry Watson Children's Aid 

 Society of Baltimore and was a delegate to 

 the White House Conference called by Presi- 

 dent Roosevelt in February, 1909, to consider 

 the subject of the dependent child. He was 

 also a member of the executive committee of 

 the State Tuberculosis Association and a 

 vice-president and chairman of the executive 

 committee of the federated charities of Balti- 

 more. 



Numerous scientific societies have elected 

 him to membership, among them the National 

 Academy of Science, of which he was chair- 

 man of the Geological Section, the American 

 Philosophical Society, the Philadelphia Acad- 

 emy of Natural Sciences, the American Acad- 

 emy of Arts and Sciences, the Deutsche Geol- 

 ogische Gesellschaft, the Washington Acad- 

 emy of Science, Paleontologische Gesellschaft, 

 and the American Association for the Ad-. 

 vancement of Science. He was councillor and 

 treasurer of the Geological Society of Amer- 

 ica at the time of his death. In 1904 he was 

 elected a foreign correspondent of the Geo- 

 logical Society of London. He was also presi- 

 dent of the Association of State Geologists. 

 A m herst conferred on him the degree of LL.D. 

 in 1908. He had numerous offers from other 

 institutions, perhaps the most imiportant being 

 the professorship and head of the department 

 of geology at Harvard University, but all of 

 these were refused, and his devotion to Hop- 

 kins and the ideals for which it stood was un- 

 swerving. 



At the time of the International Geological 

 Congress in St. Petersburg in 1897 Professor 

 Clarke was an official delegate from the United 

 States and spent several months in an extended 

 trip through Eussia and its provinces. In 

 1906 he spent the summer on an expedition to 

 central Alaska, visiting the region to the north 

 of Prince William Sound. He traveled ex- 

 tensively in western America and Mexico, 

 reaching distant portions of the western Sierra 

 Madre district. 



