Lee's surrender, many of the prisoners were liberated on taking the
oath of allegiance to the Federal Government. But Handerson did not
consider his allegiance to the Southern Confederacy ended until
after the capture of President Davis, and it was not until June 17,
1865, that he signed the oath of allegiance and was liberated in
Philadelphia.

Since that time, with that spirit of tolerance and openness to truth
which characterized the man, he has said, "in the triumph of the
Union, the war ended as it should have ended."

Mr. Handerson then resumed his medical studies, this time in the
College of Physicians and Surgeons of New York, Medical Department of
Columbia University, taking the degree of M.D. in 1867. Hobart College
conferred the A.M. in 1868. On October 16, 1872, he married Juliet
Alice Root, who died leaving him a daughter.

February 25, 1878, Dr. Handerson read before the Medical Society of
the County of New York an article entitled, "The School of Salernum,
an Historical Sketch of Mediæval Medicine." This essay attracted wide
attention to his scholarly attainments and love of laborious research.
For example, Professor Edward Schaer of the chair of Pharmacology
and Pharmaceutical Chemistry, of Neumünster-Zürich, pronounces
this pamphlet "a valuable gift ... a remarkable addition to other
historical materials ... in connection with the history of pharmacy
and of pharmaceutical drugs"; that he found in it "a great deal of
information which will be sought for in vain in many even renowned
literary works."

Dr. Handerson practiced medicine in New York City, from 1867 to 1885,