Neo-Darwinism: time to reconsider
By Richard Milton
It was the dazzling gains made by science and technology in the nineteenth century through the application of rational analysis that led people to think of applying reason to other fields.
Following the brilliant success of reason and method in physics and chemistry -- especially in medicine -- it was natural for science to seek to apply the same analytical tool to the most intractable and complex problems: human society and economic affairs; human psychology; and even the origin and development of life itself. The result was the great mechanistic philosophies of the last century: Marxism, Freudianism and Darwinism.
The simplicities and certainties of these systems mirrored the intellectually well-ordered life of Victorian society with its authoritarian values and institutionalised prejudices. Now, a century later, all three systems have run their course, have been measured by history, and have been ultimately found to be inadequate tools of explanation.
Unlike Marx and Freud, Darwin himself remains esteemed both as a highly original thinker and as a careful researcher (his study of fossil barnacles remains a text book example for palaeontologists). But the theory that bears his name was transformed in the early years of this century into the mechanistic, reductionist theory of neo-Darwinism: the theory that living creatures are machines whose only goal is genetic replication -- a matter of chemistry and statistics; or, in the words of professor Jacques Monod, director of the Pasteur Institute, a matter only of "chance and necessity". [1]
And while the evidence for evolution itself remains persuasive -- especially the homologies that are found in comparative anatomy and molecular biology of many different species -- much of the empirical evidence that was formerly believed to support the neo-Darwinian mechanism of chance mutation coupled with natural selection has melted away like snow on a spring morning, through better observation and more careful analysis.
Marxist, Freudian and neo-Darwinist systems of thought ultimately failed for the same reason; that they sought to use mechanistic reductionism to explain and predict systems that we now know are complexity-related, and cannot be explained as the sum of the parts.
In the case of neo-Darwinism, it was not the mysteries of the mind or of the economy that were explained. It was the origin of the first single-celled organism in the primeval oceans, and its development into the plant and animal kingdoms of today by a strictly blind process of chance genetic mutation working with natural selection.
In the first five decades of this century -- the heyday of the theory -- zoologists, palaeontologists and comparative anatomists assembled the impressive exhibits that generations of school children have seen in Natural History Museums the world over: the evolution of the horse family; the fossils that illustrate the transition from fish to amphibian to reptile to mammal; and the discovery of astonishing extinct species such as "Archaeopteryx", apparently half-reptile, half-bird.
Over successive decades, these exhibits have been first disputed, then downgraded, and finally shunted off to obscure museum basements, as further research has shown them to be flawed or misconceived.
Anyone educated in a western country in the last forty years will recall being shown a chart of the evolution of the horse from "Eohippus", a small dog-like creature in the Eocene period 50 million years ago, to "Mesohippus", a sheep-sized animal of 30 million years ago, eventually to "Dinohippus", the size of a Shetland pony. This chart was drawn in 1950 by Harvard's professor of palaeontology George Simpson, to accompany his standard text book, "Horses", which encapsulated all the research done by the American Museum of Natural History in the previous half century.
Simpson plainly believed that his evidence was incontrovertible because he wrote, 'The history of the horse family is still one of the clearest and most convincing for showing that organisms really have evolved. . . There really is no point nowadays in continuing to collect and to study fossils simply to determine whether or not evolution is a fact. The question has been decisively answered in the affirmative.' [2]
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