424 AUGUSTUS ALLEN HAYES. 



merous observations on this and other bodies of water have proved the 

 high practical value of the application, and demonstrated the presence 

 of a stream of naturally j^ure water, nearly twenty feet deep, flowing 

 without contamination over impure water. After the outbreak of the 

 civil war, Doctor Hayes called public attention to the uncertainty of 

 the foreign supply of saltpetre, and the necessity of domestic produc- 

 tion. His efforts resulted in the manufacture of the supply for the 

 navy from caustic potash and nitrate of soda by a novel process, the 

 product being of great purity. 



Doctor Hayes visited Europe in 1867, and after his return, at the 

 close of the following year, was attacked by a serious illness. Recov- 

 ering from the first shock, he lived nearly thirteen years, enduring con- 

 tinuous suffering with great patience and tranquillity. He died at his 

 home in Longwood, June 21, 1882, at the age of seventy-six years. 

 His wife, the daughter of the Rev. Samuel Dana of Marblehead, who 

 bad devoted herself wholly to caring for him during his long sickness, 

 had died previously, in 1879. 



The honorary degree of M. D. was conferred on Doctor Playes in 

 1846 by Dartmouth College, to which institution he afterwards pre- 

 sented his scientific library. He was elected Fellow of this Academy, 

 August 8, 1838, and his last scientific communication, that on the 

 wide distribution of vanadium, was made to our body. He had the 

 rare faculty of interesting practical men in scientific subjects, and his 

 familiar talks at the meetings of the Thursday Evening Club were 

 highly esteemed in Boston. His chief occupation was that of a con- 

 sulting chemist, and he was for many years the chief authority in this 

 vicinity on all the great commercial questions involving chemical prin- 

 ciples. His opinions were highly valued, and the many industrial 

 interests wisely fostered under his direction gave him an ample com- 

 petency. He was a warm and generous friend, quick and ardeut in 

 his sympathies, full of kindness and good works. During his long 

 illness, when, after such an active life, he was confined either to his 

 bed or to an invalid's chair, he showed a fortitude, a resignation, and a 

 cheerfulness which made a visit to his home an attractive pilgrimage, 

 and these qualities, which won at the time the admiration of his friends, 

 may be here recorded for a memorial of the nobility of his character. 



Papers hy Augustus Allen Hayes, M. D. 



1. Localities of Minerals in Vermont. Sill Journ., XIII , 1828, pp. 195, 196. 



2. On the Combinations of Chromium. Sill. Journ., XIV., 1828, pp. 136-144. 



3. On a Portable Hygrometer. Sill. Journ., XVII., 1830, pp. 351, 352. 



