Obituary. 163 
OBITUARY. 
Joun Wr11amM Draper, M.D., LL.D.—The death of Dr. Draper, 
which occurred on the 4th of January, removes the most renowned 
investigator in molecular physics and the most encyclopedic author 
in the circle of American scientists. Although born in England, 
age of 22, and in 1836, took the medical degree from the Univer- 
sity of Pennsylvania where his thesis on the Crystallization of 
publishing the results of his work in this Journal, the Journal 
; he American Journal of Medical Science, 
and in the London Philosophical Magazine. These researches 
, being 
Knowledge of Radiant Energy” (473 pp. 8vo). This volume was 
noticed at the time of its publication in vol. xvi, p. 390 (1878) of 
this Journal. It remains a noble monument to his memory, made 
of the results of labors which have greatly advanced the sum 
of human knowledge. 
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