OBITUARY NOTICES. V 
1857-58, Dr. Leidy being then its Director; Secretary of Pennsyl- 
vania State Medical Society in 1858; Secretary of Section B of the 
American Association of Science in 1870; one of the founders of 
the American Public Health Association in 1872, and its Vice- 
President in 1875-76; member of the College of Physicians, of the 
Philadelphia Clinical Society, Contemporary Club, Science and 
Art Club, Browning Society, etc., ete. 
He became a member of the American Philosophical Society in 
1863, and contributed at least five papers to its PROCEEDINGS ; 
among them one on Organic Physics, in 1872, very remarkable for 
its close reasoning and advanced thought, and another on Some 
Disputed Points in Physiological Optics, explaining complementary 
color spectra by interference, rather than by fatigue; also paper 
on Lxtuition and Intuition, approved by Dr. McCosh. 
In addition to all these varied activities he was a prolific writer 
and worker in the various fields of philanthropy, physiology, 
hygiene, literature, botany, natural science, medicine, theology and 
pure philosophy, asa glance at his appended bibliography will show. 
He followed closely inductive methods of thought and expressed 
himself always with classic purity, neatness and exactness; as 
instances may be given his introduction and employment of the 
‘term ‘‘extuition’’ as an equaily certain and correlated source of 
our knowledge with ‘‘ intuition,’? @ommended by Dr. McCosh, and 
of the term ‘ autoplanatic ’’ to describe the mode of dissemination 
of cholera. In his writings on the latter, and also on quarantine 
as protective against cholera and yellow fever, he long ago took 
ground now held by the bacteriologists of to-day. So in his signed 
contributions to Johnson’s Cyclopedia, that on Evolution is an 
elaborate historical account and analysis of the different theories 
of development, ending with adoption of the theory of Theistic 
Evolution. (This antedates Huxley’s article in Lxcyclopedia 
Britannica. ) 
So again we find him emphatically among the leaders and 
pioneers in the work of Higher Education for Women and Co-edu- 
cation of the Sexes; while his bold and caustic criticism on the 
modern treatment of pneumonia and other acute diseases, as read 
before the College of Physicians and published in their Zransac- 
tions in 1888, shows that he was not afraid or ashamed to speak the 
whole truth when needful. 
Yet with all his power of logic, wit, raillery and pungent, poig- 
