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DarwinismpennCOMES TO 38 NOV | DEC 2009 THE PENNSYLVANIA GAZETTE A century-and-a-half after the November 1859 publication of On the Origin of Species, a Penn microbiologist looks back at how Darwin’s ideas were received by some of the University’s leading thinkers. BY HOWARD GOLDFINE June 18, 1858, Charles Darwin received a manu- him. Darwin wrote to Charles Lyell, “If Wallace had my ON script from Alfred Russel Wallace, which outlined [manuscript] sketch written out in 1842, he could not have a theory of evolution based on natural selection. Wallace’s written out a better short abstract!” letter came from an island in the Malay Archipelago, where Fortunately, Darwin had previously outlined his theory to he was collecting field specimens and studying the distribu- his friends, the distinguished geologist Lyell and the bota- tion of species. Wallace, like Darwin, invoked the Malthusian nist Joseph D. Hooker, and in a brief, unpublished draft to concept that a struggle for existence within rapidly expand- Asa Gray, a botanist at Harvard. Lyell and Hooker immedi- ing populations would be the driving force for selection of ately arranged for Wallace’s paper and a brief summary of natural variants within a species. Darwin’s immediate reac- Darwin’s theory to be read simultaneously at the Linnaean tion was one of dismay. He had been working on his “big Society in London on July 1, 1858. These were received with book on species” since his five-year voyage on the Beagle little comment. The president of the society later noted that (1831-36) and a relatively unknown naturalist had forestalled nothing of great interest had happened that year. ILLUSTRATION BY DAVID HOLLENBACH THE PENNSYLVANIA GAZETTE NOV | DEC 2009 39 On November 24, 1859, under great anthrax in the guts of termites. Leidy’s Leidy was not a theorist, but his pressure, Darwin published the fuller reputation was secured at an early age; immediate grasp of Darwin’s theory version of his theory, On the Origin of by 1848 he was being received by emi- shows him to be a man who understood Species, which he described as an nent men of science on trips to Europe. and could appreciate Darwin’s ideas. abstract of his big book, proposing to Leidy’s growing renown was not based This was in large part because his provide more complete evidence later. on his microscopic observations alone. observations of microscopic organ- The book was addressed to the literate, Numerous fossils excavated by enthusi- isms, insects, mollusks, and the large general public, which in the mid-19th asts and professionals were sent to the ancient fauna bore evidence that century consisted of a small propor- ANSP and entrusted to him. It was Leidy entirely supported them. In his address tion of Britons. The first printing of who showed that the modern horse had to the medical school Class of 1886, 1,250 sold out on the first day of sale, antecedents on this continent, but these Leidy noted that “The genesis or origi- and subsequent printings were eagerly had become extinct and were replaced nal production of life is directly attrib- received. Although there was consider- much later by horses brought over by uted to God, but the manner of its cre- able controversy, the earliest criticisms early European explorers. He found that, ation has always been and still remains were mainly published in learned and although many of the fossils he exam- a mystery … According to the doctrine religious journals. It was a book that ined resembled previously discovered of the evolution of life, living beings was more discussed than read. The first species of the Old World, they were sig- have derived from one another, the American edition was published the fol- nificantly different and had to be care- most complex and highest forms of lowing year by Appleton of New York. fully described, classified, and named. plants and animals being the slowly Philadelphia, one of the centers of learn- Two of the era’s major fossil hunters, modified descendants of less complex ing, was one of the first cities on the Edward Drinker Cope and Ferdinand plants and animals … and so on until continent to engage in the controversy. Vandeveer Hayden (on whom more below), we go back to the earliest and simplest The University of Pennsylvania, the were based in Philadelphia. Leidy was the plants and animals.” Leidy believed Academy of Natural Sciences (ANSP), man they trusted to do the difficult work that the formation of the infinite num- and the American Philosophical Society of analysis of their new finds. In view of ber of kinds of living things can be were well-established institutions in Leidy’s wide-ranging studies, his biogra- explained by the “incessant individual the then expanding city. The reception pher Leonard Warren, professor emeritus variation … their adaptation ‘to envi- of Darwin’s ideas was decidedly mixed. of cell and developmental biology at Penn roning conditions’ and transmission of and Institute Professor Emeritus at acquired individual peculiarities.” Wistar, subtitled his 1998 book on Leidy, Whether he meant acquired in the JOSEPH LEIDY (1823-91) “The last man who knew everything.” sense of Lamarckian adaptation or An early convert. By 1860 Leidy was professor of anat- through variation in the hereditary omy in the School of Medicine. His makeup is not clear from this state- ne of the earliest American readers belief in the evolution of higher organ- ment, but many naturalists at the time of Darwin’s theory was Joseph Leidy, isms from the simplest unicellular leaned towards the view that changes Oson of a Philadelphia hatter, who organisms predated his first contact in living organisms resulted from adap- had received his medical training at with Darwin’s theory, but Origin of tation to the environment and some- Penn (1840–44), but later left the prac- Species transformed his understand- how these newly acquired characteris- tice of medicine for a life of teaching ing. His letter to Darwin after reading tics were passed on to their progeny. and research. His researches ranged the book has been lost, but Warren For a time at the end of the 19th centu- over much of 19th-century biology, a reports that he is said to have thanked ry neo-Lamarckism had become the large part of it based on observations Darwin for “putting night into day … I dominant theory of evolution. made with his beloved microscope—a felt as though I had groped about in In the same lecture, Leidy said that present from his stepmother. He is darkness, and that all of a sudden, a Darwin’s theory met many objections acknowledged as America’s first para- meteor flashed upon the skies.” Darwin at first, just as Newton did when he sitologist, having discovered the larvae responded, “Your note has pleased me “announced the law of gravitation, peo- of Trichina spiralis in ham. He later more than you could readily believe: ple objected to it, for they regarded it as a observed that “trichinosis, caused by for I have during a long time, heard all denial of God’s control of the movements trichina, [is] introduced into our body good judges speak of your paleonto- of the universe; and when Franklin sug- in pork, a meat which was declared to logical labors in terms of the highest gested the use of the lightning-rod, it was be unfit for food, thousands of years respect. Most Paleontologists (with denounced as an impious attempt to ago, by the great law-giver Moses.” some few good exceptions) entirely deprive the Deity of his thunderbolts.” As a result of his studies, preventive despise my work; consequently appro- Leidy was highly honored during his medicine, which he extolled to the bation from you has gratified me life with election to over 50 national University’s 1886 graduating class, dic- much.” Leidy proposed Darwin for and international scientific societies tated the thorough cooking of pork and membership in the ANSP, and he was and prestigious lectureships, but his most foods. Leidy also observed bacte- elected in 1860—an honor that Darwin reputation did not last far into the follow- ria related to the organisms that cause gratefully acknowledged. ing century. His modesty and unwilling- 40 NOV | DEC 2009 THE PENNSYLVANIA GAZETTE driving force in evolution. Instead, he [Leidy] is said to have thanked Darwin for became one of the leading exponents of “putting night into day … Neo-Lamarckism, the inheritance of acquired characteristics. In his view, I felt as though I had groped natural selection would serve to fix those characteristics that made the about in darkness, and that organism more fit within its environ- all of a sudden, a meteor ment. He wrote that the need for chang- es in an organism would lead to an flashed upon the skies.” acceleration or retardation of growth during embryonic development of the ness to theorize have relegated him to Wyoming, made when the Union Pacific organ affected. The same idea was pro- the second rank of naturalists even tracks were being laid. This cut revealed posed by Alpheus Hyatt of Boston, with though he was one of the greatest thick beds of fossil fish, and Cope quick- whom Darwin corresponded extensive- American scientists of his day. Recently, ly became a leading specialist. Cope and ly. Darwin found their writings to be debate over Leidy’s historical signifi- Othniel Charles Marsh, a paleontologist unintelligible, and eventually gave up cance has begun to revise our estima- at the Peabody Museum of Natural trying. In expounding his views, Cope tion of his importance for 19th-century History at Yale, were friendly at first, invented new terms such as bathmism American science.