Darwin, Then and Now

Charles Darwin attempted to avoid the use of the term “vestiges” largely because the term had been associated with the “erroneous” Larmarckian concept of “use and disuse” that was only “veritable rubbish.”

Jean-Baptiste Lamarck (1744 – 1829) was a member of the French Academy of Sciences and was appointed to the Chair of Botany in 1788. When the Muséum national d’Histoire naturelle was founded in 1793, Lamarck was appointed professor of zoology. In 1801, he published Système des animaux sans vertèbres, a major work on the classifications and coined the term invertebrates. Lamarck is thought to be the first use the term biology in its modern sense. Lamarck continued his work as a premier authority on invertebrate zoology.

Darwin did credit “Lamarck as the first man whose conclusions on the subject excited much attention.… In these works he up holds the doctrine that all species, including man, are descended from other species.”

Lamarck’s theory of evolution, which he referred to as “transformism,” was based on the idea that individuals develop new traits during their own lifetimes by “use and disuse” and transmit them to the next generation. Larmack writes – “Progress in complexity of organization exhibits anomalies here and there in the general series of animals, due to the influence of environment and of acquired habits.”

The giraffe served as Lamarck’s classic example of evolution through “use,” acquiring longer necks in successive generations in competition to reach the ever-scarcer leaves higher in the trees. In illustrating Lamarck’s views on adaptation, Darwin wrote, “To this latter agency he seems to attribute all the beautiful adaptations in nature; such as the long neck of the giraffe for browsing on the branches of trees.”

For Darwin, however, this explanation was simply not scientific – “Lamarck, who believed in an innate and inevitable tendency towards perfection in all organic beings, seems to have felt this difficulty so strongly that he was led to suppose that new and simple forms are continually being produced by spontaneous generation. Science has not as yet proved the truth of this belief.”

One of the most eminent pre-Darwinists was Charles Darwin’s own grandfather, Erasmus Darwin (1731–1802). Erasmus discussed his ideas at length in a two-volume work, Zoonomia, published in 1794. Erasmus wrote that “all … have risen from one living filament.”

Erasmus’ book was widely popular in Western Europe- even translated into German, French, and Italian. Erasmus envisioned that the driving force behind species modification was a result of “lust, hunger, and danger.” In line with Greek philosophy, Erasmus envisioned changes by “continuing to improve its own inherent activity.”

Actually how these “improvements” developed was completely unknown to Lamarck and Erasmus—evolution was a philosophy, not a science. The unknown cause of “improvements” is what drove Darwin to discover the underlying laws of nature—scientifically. Writing in the preface of The Origin of Species, Darwin suggests how Erasmus’s work, although “erroneous,” may have influenced Lamarck: “It is curious how largely my grandfather, Dr. Erasmus Darwin, anticipated the views and erroneous grounds of opinion of Lamarck in his Zoonomia.”

For Lamarck, new characteristics are acquired through the process of “use and disuse.” Darwin’s grandfather, Erasmus Darwin, was a Lamarckian evolutionist. Charles Darwin, however, in pursuit of a “scientific theory” of evolution, initially opposed Lamarckian evolution, only granting the theory marginal support.

In a letter written to J. D. Hooker in 1844, Darwin wrote, “Heaven forefend me from Lamarck nonsense of a ‘tendency to progression.’ … But the conclusions I am led to are not widely diff erent from his, though the means of change are wholly so.” “With respect to books on this subject,” Darwin continues, “I do not know any systematic ones, except Lamarck’s, which is veritable rubbish.”

Although attempting to distance himself from Lamarck’s concepts of “use and disuse” and “vestages,” Darwin distain for “use and disuse” eventually waned as causes for the origin of variation required for the actions of natural selection remained Darwin’s largest unsumountable enigma.

Since then, the term, “vestiges” has once again gained prominence over “rudiments,” as has Larmarckian concepts of evolution. The question remains, however, are structures classified as “vestiges” evidence of evolution? Specifically, have vestiges seemingly lost all or most of their original function in a species through evolution?

To address answers to these questions, we will be examining the most popular example of vestiges—the mammalian appendix in the up-coming posts.   

Charles Darwin only uses the term “vestiges” five times in The Origin of Species. Ironically, since then vestiges have become synonomous with evolution. The emenent evolutionist, Douglas Futuyma, Professor of Ecology and Evolutionary Biology at the University of Michigan, notes that vestigial structures make no sense without evolution.

In this first in a series, we will discover how structures labeled vestiges have played an important role as evidence for the theory of evolutionary. By the time The Origin of Species was published in 1859, vestiges had already been a hot topic. It was Robert Chambers in the publication of his book entitled Vestiges of the Natural History of Creation in 1844 that popularized the concept of vestiges. Chambers brought together various ideas of stellar evolution and progressive transmutation of species. The book was a best-seller is considered largely responsible for causing a shift in public opinion that paved the way for the general acceptance of evolution following the publication of  The Origin of Species.

While agreeing with the general concept of evolution, Darwin took many exceptions with Chamber’s perspective on vestiges and the concept that evolution occurs by sudden changes in nature. Darwin wrote – “The author [Chambers] apparently believes that organisation progresses by sudden leaps, but that the effects produced by the conditions of life are gradual.”

Perhaps because of these differences with Robert Chambers, Darwin even avoided defining the term “vestiges” in The Origin of Species. In the Glossary, however, Darwin defines a related term: “RUDIMENTARY.—Very imperfectly developed.” In The Origin of Species, the term “rudimentary” appears 101 times.

Darwin envisions rudimentary structures to be the result of two different dynamics: 1) as structures “imperfectly developed”—emerging, and 2) as structures in disuse undergoing loss of function—elimination. Darwin writes – “Rudimentary organs will speak infallibly with respect to the nature of long-lost structures”—a Lamarckian disuse concept. Darwin explains that rudimentary structures continue to exist because “natural selection… had no power to check deviations in their structure.”

Today however, only the process of elimination due to the disuse concept is thought to be in operation. WIKIPEDIA.org states: “Vestigiality describes homologous characters of organisms that have seemingly lost all or most of their original function in a species through evolution. Answers.com defines vestige structures, as “A rudimentary or degenerate, usually nonfunctioning, structure that is the remnant of an organ or part that was fully developed or functioning in a preceding generation or an earlier stage of development.”

 This takes us to the next question – why did Darwin largely attempt to avoid the term vestiages that was associated with the Larmarckian concept of use and disuse?

Jerry A. Coyne, one of the leading evolutionists at the University of Chicago, in his new book entitled Why Evolution is True (2009) writes “much confusion and misunderstanding surrounds evolution” even though “the modern theory is easy to grasp.” The question is how can a theory be “easy to grasp” and still be surrounded by “much confusion”?

But what could the confusion be over? Here are some examples.  Charles Darwin wrote in The Origin of Species - “There is no logical impossibility in the acquirement of any conceivable degree of perfection through natural selection”. Coyne contradicts Darwin by stating – “natural selection does not yield perfection”. Over a trivial issue, confusion reigns over whether natural selection can or cannot produce perfection in nature.

Presumably, to show how easy the theory of evolution is to understand, Coyne features what he calls the six basics of evolution: “evolution, gradualism, speciation, common ancestry, natural selection, and nonselective mechanisms”. For Coyne, natural selection is not the exclusive driving force of evolution.

Niles Eldredge, evolutionary biologist and curator of the American Museum of Natural History, disagrees. Niles Eldredge, architect  and designer of the museum’s currently touring Darwin exhibit in the companion book Darwin, Discovering the Tree of Life (2005), credits Darwin with discovering the actions of natural selection—the essence of evolution: “When [Darwin] formulated the principle of natural selection, he had discovered the central process of evolution.”

Unlike Coyne, Eldredge envisions evolution acting exclusively through the process of natural selection: “A century and a half ago, Charles Darwin offered the world a single, simple scientific explanation for the diversity of life on Earth: evolution by natural selection.” Unlike Coynes six basics of evolution, Eldredge uses a VISTA acronym for natural selection that stands for Variation, Inheritance, Selection, Time, and Adaptation.

Differences in approach even between Coyne and Eldredge, exemplify why evolution theory continues to be confusing—even on the basics. The teaching of evolution is in chaos. Coyne pines “most of my university students who supposedly learned evolution in high school, come to my courses know almost nothing about this central organizing theory of biology.” Could it be because a unified theory of evolution simply does not exist?

Even university science major graduates seem to be no better. T. Ryan Gregory and Cameron A. J. Ellis, in their paper entitled “Conceptions of Evolution Among Science Graduate Students” published in BioScience 59(9):792-799 (2009), surprizingly found that less than 30% of students pursuing advanced science degrees could correctly identify even the basic principles of evolution.

The reason is—a comprehensive theory of evolution simply does not exist. Even with the convening of the most respected evolutionary scientists at the Altenberg Summit in 2008, no consensus was reached on a comprehensive theory of evolution.

Given the flood of available evidence, in the wake of Crick’s Central Dogma collapse, evolution is a theory that remains in chaos—now more than ever.

Species and natural selection are the two most common terms Charles Darwin uses in the book from the title—The Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life.

In the “Glossary of the Principle Scientific Terms Used in the Present Volume”, while Darwin defines “Organism” as “An organised being, whether plant or animal”, surprizingly, neither “species” nor “natural selection,” the key terms of the book, are defined in the Glossary. The question is why.

Defining “species” became one of Darwin’s great challenges. From the start, Darwin recognized that among naturalists of the day, the term “species” did not have a consistent definition: “No one definition has satisfied all naturalists; yet every naturalist knows vaguely what he means when he speaks of a species. Generally the term includes the unknown element of a distinct act of creation.”

 Unlike Newton who was able to measure and test the laws of gravity, Darwin had to deal with the problem that there “is no possible test but individual opinion to determine which of them shall be considered as species and which as varieties.”

In the pursuit for a definition, Darwin suggested that as a variety begins to exceed the number of the parent species, the new variety becomes a new species: “If a variety were to flourish so as to exceed in numbers the parent species, it would then rank as the species.” In other words, species was simply a numbers game.

Darwin’s numbers game approach was never seriously taken—even by Darwin himself. After 150 years, the problem of defining species has not been resolved and is now known as the long-standing “Species Problem.”

Jody Hey of Rutgers University wrote in Trends in Ecology & Evolution (2001) – “The species problem is the long-standing failure of biologists to agree on how we should identify species and how we should define the word ‘species’. The innumerable attacks on the problem have turned the often-repeated question ‘what are species?’ into a philosophical conundrum.”

Massimo Pigliucci professor of Ecology and Evolution at the State University of New York at Stony Brook noted in BioEssays (2003) “First, the species problem is not primarily an empirical one, but it is rather fraught with philosophical questions that require – but cannot be settled by – empirical evidence.”

The Origin of Species is loaded with plastic contradictory definitions even on the central term of the book—species. Darwin eventually concedes on the definition of species by writing – “We have seen that there is no infallible criterion by which to distinguish species and well-marked varieties.”

Today, known evidence remains compatible with the following definition of species that Darwin long endvoured to eliminate – “Generally the term [species] includes the unknown element of a distinct act of creation.”

Charles Darwin struggled with significant health problems. Just less than two weeks before publication of The Origin of Species, Darwin described his condition to his cousin Fox in a letter, stating, “I have had a series of calamities; first a sprained ankle, and then badly swollen whole leg and face; much rash and a frightful succession of Boils—4 or 5 at once. I have felt quite ill—and have little faith in this ‘unique crisis’ as the Doctor calls it, doing me much good. I cannot now walk a step from bad boil on knee.”

Things that Darwin once found pleasurable as a young man turned on him. By 1865, at the age of fifty-six, Darwin summed up his problems in writing to a new medical adviser by writing that for twenty-five years he had experienced extreme flatulence, preceded by ringing ears and visual black dots, and vomiting preceded by shivering and crying.

In 1871, one year before the publication of the sixth and final edition of The Origin of Species, in a letter to his natural selection collegue, Alfred Wallace, Darwin confided: “present I feel sick of everything, and if I could occupy time and forget my daily discomforts, or rather miseries, I would never publish another word.”

Time and health took a toll on Darwin’s mind: “I have said that in one respect my mind has changed during the last twenty or thirty years. Up to the age of thirty, or beyond it, poetry of many kinds, such as the works of Milton, Gray, Byron, Wordsworth, Coleridge, and Shelley, gave me great pleasure, and even as a schoolboy I took intense delight in Shakespeare, especially in historical plays. But now after many years I cannot endure to read a line of poetry: I have tried lately to read Shakespeare, and found it so intolerably dull that it nauseated me. I have also lost my taste for pictures or music.”

What caused Darwin’s life-long health problems? To explain why Darwin experienced such poor health, scientists have pointed to a one night event east of the Andes near Mendoza in March 1835—Darwin wrote: “At night I experienced an attack (for it deserves no less a name) of the Vinchuca, a species of Reduvius, the great black bug of the Pampas. It is most disgusting to feel soft wingless insects, about an inch long, crawling over one’s body.” Darwin is thought to have been bitten by an insect called the “Great Black Bug of the Pampas” carrying the infectious parasite Trypanosoma cruzi.

For over a period of forty years, Darwin suffered intermittently from various combinations of symptoms such as malaise, vertigo, dizziness, muscle spasms and tremors, vomiting, cramps and colics, bloating and nocturnal intestinal gas, headaches, alterations of vision, severe tiredness, nervous exhaustion, dyspnea, skin problems such as blisters all over the scalp and eczema, crying, anxiety, sensation of impending death and loss of consciousness, fainting, tachycardia, insomnia, tinnitus, and depression. However, since attempts to test Darwin’s remains at the Westminster Abbey by using modern PCR techniques have been refused by the Abbey’s curator, the real cause of Darwin’s health problems remains only speculative.