ELIOT CHANNING CLARKE. 483 



engaged upon other engineering works, viz., the bridge over the 

 Mississippi River at Hannibal, Mo., and other structures built by the 

 Phoenix Co., the Chicago Water Works Tunnel, and the Chicago 

 Sewerage System. 



In the dull times which followed the Panic of 1873, Mr. Clarke re- 

 turned to Boston to take further special studies at the Institute of 

 Technology in 1875-76. In July of the latter year he was appointed 

 Engineer in charge of a survey for a main drainage system for Boston. 

 The project was adopted and construction was begun in 1877. It was 

 carried through to completion in 1884 under the supervision of Mr. 

 Clarke, who published a description of the work in 1885. At this 

 time he was recognized as one of the leading sanitary engineers of the 

 United States. In 1885 he received the Norman Medal of the Ameri- 

 can Society of Civil Engineers for his paper entitled " A Record of 

 Tests on Cement Made for the Boston Main Drainage Works." In 

 the work which this paper describes a great deal of cement had been 

 used and Mr. Clarke had made some novel and valuable experiments. 

 Among other things, he was one of the first to prove and to advocate 

 the importance of fine grinding of cement, showing that the coarse 

 grains had very little cementing quality. In 1884 he became Chief 

 Engineer of the Massachusetts Drainage Commission, which was 

 appointed to design methods of preventing pollution of the waters of 

 the Charles, Mystic and Blackstone River basins. 



Shortly after this time he gave up his strictly engineering work to 

 become the Manager of mill properties at Lowell, to which his atten- 

 tion was devoted for a number of years. His retirement from engi- 

 neering was a distinct loss to the profession. 



Mr. Clarke was a man of wide interests. He was a Fellow of the 

 American Academy of Arts and Sciences, and its Treasurer for eleven 

 years. He was a member of the Massachusetts Natural History 

 Society, the Massachusetts Horticultural Society, the Colonial So- 

 ciety, and the Corporation of the Massachusetts Institute of Tech- 

 nology. He served also as a trustee of the Massachusetts School for 

 the Feeble Minded, as trustee and vice-president of the Provident 

 Institution for Savings, as director of the State Street Trust Co. and 

 of other companies. He was interested in astronomy and prepared a 

 work on that subject. 



Mr. Clarke was married in 1878 to Alice V. Sohier, by whom he had 



