356 
ANNALS NEW YORK ACADEMY OF SCIENCES 
national surveys, and was still further postponed by the untimely death of 
Henry Newton in Deadwood, August 5th, 1877. Not until three years later, 
and then under the skilful and sympathetie editorship of G. K. Gilbert, was 
the volume issued. Nevertheless Mr. Caswell’s work on the petrography of 
the Hills will always be associated in the minds of students of the subject 
with Zirkel’s Report for the Fortieth Parallel Survey (1876) and George 
Hawes’s Lithology of New Hampshire (1878). 
In 1877 business responsibilities again drew Mr. Caswell away from his 
position as teacher of mineralogy, and he reluctantly gave up his prospect of 
a professor’s chair. None the less, however, his interest in mineralogy 
continued all his life, and his collection, the delight of his leisure hours, 
became an exceedingly choice one. He kept up his connection with fellow 
mineralogists all over the world and has had one mineral “caswellite” named 
after him by his fellow-student at Columbia and life-long friend, Professor 
Albert H. Chester, whom, in fact, he had succeeded when becoming assistant 
to Professor Egleston in 1869. 
In his later years, Mr. Caswell occupied many positions of trust in New 
York. For years he was on the Finance Committee of the New York 
Academy of Sciences. At his decease, October 16th, 1909, but six active 
members exceeded him in length of membership. He was a vestry-man of 
Trinity Church and was treasurer of several Church Institutions, for one of 
which he raised a fund of over $200,000. He was a member of the 
Century Association, was deeply interested in the Grolier Club and was a 
supporter of many scientific societies in the Metropolis. 
In character, Mr. Caswell was marked by exceptional modesty, sincerity 
and faithfulness. All through his life he was marked by his loyalty to his 
friends, not only those of his student days but even those of his boyhood. He 
was ever ready to be of assistance in scientific matters and was constantly 
helpful in other relations to those who sought his aid. All who were privi¬ 
leged to have known him, will cherish his remembrance through life. 
In eighteen seventy-two, Mr. Caswell was married to Mary B. Curtiss, 
who survives him after many years of close and sympathetic companionship. 
