On the Origin of Species: Young Readers Edition
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About this ebook
Charles Darwin’s famous theory of natural selection shook the world of science to its core, challenging centuries of orthodox beliefs about life itself. Darwin’s boundary-shattering treatise was captured in On the Origin of Species, originally published in 1859, a groundbreaking and detailed study on ecological interrelatedness, the complexity of animal and plant life, and the realities of evolution.
This Young Reader’s Edition makes Darwin’s cornerstone of modern science accessible to readers of all ages. Meticulously curated to honor Darwin’s original text, this compelling edition also provides contemporary insight, photographs, illustrations, and more. This adaptation is a must-have for any reader with a curious mind and the desire to explore one of the most influential books of our time.
Charles Darwin
Charles Robert Darwin (1809–1882) was born in Shropshire, England. His first text chronicling his five-year voyage on the HMS Beagle, which included his notable visit to the Galapagos Islands, earned him success as an author in 1839. His observations from the Galapagos, alongside an interest in natural history from an early age and studies over the consequent years, informed the development of his biological theories, culminating the ground-breaking text 'On the Origin of Species' for which he is best known.
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On the Origin of Species - Charles Darwin
A portrait of Charles Darwin, painted in the late 1830s.
INTRODUCTION
Darwin’s Great Discovery
Poor man, he just stands and stares at a yellow flower for minutes at a time, said the gardener.
He would be far better off with something to do."
The gardener was talking about his employer, an English gentleman named Charles Darwin. What the gardener didn’t realize was that while Darwin spent a lot of time looking at nature, he was doing something. He was planning a revolution in science.
The revolution began in 1859, when Darwin published On the Origin of Species. The book sold out in a few days. It caused an uproar in the scientific community and beyond. Eventually it changed our understanding of all living things.
In 2015 a panel of British booksellers, librarians, publishers, and scholars listed twenty of the most important academic or scholarly books ever written. They asked the public to choose the one that had had the biggest influence on the world. The public voted for Darwin’s Origin.
Beetles, the Beagle, and Barnacles
Charles Darwin was born in 1809 in Shrewsbury, England. As a boy, he was not an outstanding student—a fact that once caused his exasperated father to tell young Charles that he would be a disgrace to yourself and all your family.
Darwin was sent to medical school in Scotland so that he could become a doctor like his father, but he lacked interest in his studies. He was also sickened by surgical operations, which were performed on terrified, screaming patients before the development of anesthetics to make them unconscious. In 1828 he switched to studying to become a clergyman at Christ’s College, Cambridge.
Darwin was already deeply interested in natural history. That broad term covers the study of the natural world: rocks, fossils, weather, geography, and all the biological sciences. In Darwin’s day, people who studied natural history were known as naturalists. Some were professors or lecturers at schools, or worked for museums. Many held other positions and pursued natural history in addition to their work. A clergyman—as Darwin was expected to become after leaving medical school—could also be a naturalist.
This drawing of the Beagle in the Strait of Magellan, near the southern tip of South America, was published in 1890, long after the voyage. It is based on an earlier drawing by one of Darwin’s shipmates.
Geology and biology were Darwin’s main passions. He became an enthusiastic collector of beetles. One of his specimens turned out to be a new species, and Darwin received credit in a scientific journal for discovering it.
Barnacles near the shoreline of Lundy Island, off the English coast.
At college, Darwin found a group of fellow students and professors who were also passionately interested in natural history. He began to be known as a promising naturalist. After completing his studies in 1831, he was invited to join a naval ship called the HMS Beagle on a long voyage around the world. His role aboard ship was unofficial, a combination of naturalist and companion to the captain. The voyage lasted for almost five years. Much of the time was spent along the coasts of South America, but the Beagle also visited Tahiti, New Zealand, and South Africa. Darwin took every opportunity to explore and to gather insects, plants, and animals from environments such as rain forests, deserts, grasslands, and coral reefs.
The Beagle spent a month in the Galápagos Islands, west of South America. There, Darwin marveled at—and collected samples of—the variety of life-forms scattered across the small volcanic isles. Darwin’s groundbreaking later work would draw on everything he observed during the Beagle’s voyage, including important bird specimens he collected in the Galápagos.
Darwin never did any more serious traveling, and he never became a clergyman. Family money and wise investments meant that he did not have to work for a living. After the Beagle voyage, he plunged into the life of a full-time naturalist. He had made a name for himself during the trip with letters to other naturalists. Once back in England, he wrote a book about the Beagle’s voyage. He also edited five volumes about the zoology of the voyage and wrote three volumes about its geology.
During this time Darwin married his cousin Emma Wedgwood. They started a family and moved to a country estate called Down House, where Darwin would live for the rest of his life. There, Darwin spent the years 1846 to 1854 in an intense research project. His goals were to sharpen his knowledge of biology and to gain credit as a serious scientist.
A species is a group of organisms in which all individuals could interbreed to produce fertile offspring. Chapter One has more details on Darwin’s definition of species
and how scientists use the word today.
A biologist was expected to be an expert on some particular group of species. Darwin chose barnacles: relatives of crabs and lobsters that attach themselves to rocks, ships, and other animals. For years, parts of his home were filled with these shelly specimens. His children grew so used to this that one of them asked a friend, Where does your father keep his barnacles?
Between 1851 and 1854 Darwin published four volumes about living and fossil barnacles. They were at once recognized as the world’s leading works on the subject. Barnacle researchers today still rely on them.
But even before he married and began the barnacle project, Darwin had been quietly working on another idea, one that he had started thinking about during the Beagle voyage. This idea would make Darwin one of the most famous and controversial naturalists in history. He called it the species question.
The Big Idea
Darwin’s big idea was about how species change over long periods of time. He was not the first naturalist to explore this idea. A few in his time and even earlier had pondered what they called the transmutation of species
(transmutation
means change in form
). In fact, Darwin’s grandfather Erasmus Darwin had published several works touching on the subject.
The idea that species might be mutable, or capable of permanent change, was extremely difficult to accept for most people of Darwin’s day, including many scientists. The traditional view was that each species had been divinely created in its present form. Some naturalists did argue that species changed over time, but even those who defended the transmutation of species could not give a convincing explanation of how species might change.
Darwin would offer that explanation.
His early work on the species question
is recorded in a notebook he started in 1837. During the Beagle voyage he had been much struck
by how various species of plants and animals were spread across South America. He had also noticed fossils that pointed to a link between the living and extinct species of that continent. These facts,
he wrote much later, seemed to me to throw some light on the origin of species.
Darwin began gathering more facts that might help him solve the mystery of how species come into being.
By the end of 1838 he had worked out his theory. He wrote a summary of it in 1842. Two years later he prepared a longer version. That’s when he first shared some thoughts on the subject, in a letter to a friend and fellow naturalist, the botanist Joseph Hooker. Darwin wrote that gleams of light have come, & I am almost convinced . . . that species are not (it is like confessing a murder) immutable [unchanging].
He added, I think I have found out . . . the simple way by which species become exquisitely adapted. . . .
Darwin made the point that living things can and often do change from generation to generation. The changes may be small, but over time, as they are passed from parents to descendants, they build up into greater and greater differences, until new species are formed. Darwin called this pattern descent with modification.
Another term for it is evolution.
The heart of Darwin’s theory was his explanation of how such changes could occur. They came about, Darwin reasoned, though a process that he called natural selection.
He would spend twenty years gathering information to support this idea, which would eventually reach the world in On the Origin of Species.
A notebook from 1837–1838 contains Darwin’s first attempt to sketch a tree of life.
What Darwin Knew and Didn’t Know
Darwin broke new ground on the species question,
but his work was still shaped by the state of scientific knowledge of his time. Darwin was helped by new scientific advances, but he was held back by gaps in what was known.
Scientists of Darwin’s time were deeply curious about the fossil remains of extinct creatures such as this triceratops, housed at the Natural History Museum of Los Angeles County.
When Darwin began his work, most scientists and many other people had accepted the idea of deep time,
or geological time, as it is now usually called. This concept started with an eighteenth-century Scottish geologist named James Hutton. He claimed that the physical history of the Earth, which could be read from its geology, had unfolded over long, long ages—much longer than previously thought.
Geological time was further developed by Charles Lyell, a leading British geologist. Lyell put the age of the Earth at more than three hundred million years, a figure that Darwin echoed in the Origin. This deep past was essential to Darwin’s theory, which argued that evolution by natural selection took place over long periods of time. Neither Lyell nor Darwin, however, grasped the true depth of geological time. Scientists today place the age of the Earth at about 4.54 billion years.
Long before Darwin, people wondered about the strange stony forms they occasionally dug out of the ground. Some, such as stone seashells found on mountaintops far from the sea, were especially puzzling. Others resembled no known living creatures. By Darwin’s time, most naturalists understood that these odd objects were fossils, remains of animals and plants that had once been alive.
Starting in the 1820s, fossils of dinosaurs opened a window on a distant past that teemed with life-forms very different from those of the present. Most naturalists agreed that the strange life-forms had become extinct, although they could not explain why. The knowledge that species could become extinct, to be known only by their fossil remains, became part of Darwin’s theory, which said that new species develop from earlier ones and then replace them. Scientists did not yet know, however, that the ancient Earth had seen episodes of mass extinction that wiped out large percentages of all existing species in fairly short periods of geological time.
Another important thing Darwin didn’t know was how traits pass from parents to their offspring. He admitted in the Origin that the mechanism of heredity was a mystery. It was plain to see, however, that traits do get passed from one generation to the next, and this fact is one of the foundations of Darwin’s theory. His work was only strengthened by later discoveries about the mechanisms of heredity—DNA, genes, and chromosomes.
Darwin’s theory was about how life changes its forms over time. He said nothing about how life itself came into existence. That is a question that scientists today are still working to answer.
Darwin’s Difficulties
Why did claiming that species were capable of permanent change feel like confessing a murder
to Darwin? Why did he wait so long to publish his theory?
Naturalist Alfred Russel Wallace, shown here in 1895, came up with the same theory as Darwin about the origin of species.
One reason is that the public and many scientists had reacted with hostility to an 1844 book called Vestiges of the Natural History of Creation. Its author, Robert Chambers, had said that species must have evolved through some kind of natural process and were not the result of divine creation. Darwin was a gentle and shy person. He did not look forward to the storm of criticism or even outrage that he felt sure his own work would unleash.
Another reason is that Darwin wanted to make sure his theory was supported by a wealth of evidence. He spent years building up that evidence and testing every part of his theory to make sure he had answers for questions or criticisms. During this time, the patient work on barnacles strengthened not only his scientific reputation but also the case for his theory.
Darwin also suffered from repeated bouts of sickness and long periods when he was exhausted and could barely work. The deaths of his father in 1848 and his beloved daughter Annie in 1851 brought lasting grief and slowed his progress. But finally, in 1856, at the urging of botanist Joseph Hooker and geologist Charles Lyell, Darwin began writing what he called the everlasting species-Book.
In addition to criticism, Darwin’s ideas drew ridicule, such as this 1871 cartoon published in Hornet magazine. Darwin wrote to a friend, "I keep all these things. Have you seen me in the Hornet?"
Two years later, Darwin had written more than half of the book when he had a terrible shock. A British naturalist named Alfred Russel Wallace wrote to Darwin from an island in what is now the Asian nation of Indonesia. Wallace wanted Darwin’s opinion of a paper he had written on how new species come into existence. When Darwin read the paper, he realized that Wallace had come up with a theory almost identical to the theory of natural selection that Darwin had been working on for so long.
Darwin wanted to be fair to Wallace, but he knew that he had been first with the idea. He turned to Lyell for advice. Together with Hooker, Lyell arranged for part of Darwin’s 1844 summary of his theory and Wallace’s paper to be read aloud together at a scientific meeting. Both men received credit for the discovery, but it was clear that Darwin had made it first.
The Origin Then and Now
Once his theory was out in the open, Darwin hurriedly completed a shorter-than-planned version of his book, which was published as On the Origin of Species. As he had feared, its appearance in 1859 caused a sensation. Some scientists supported Darwin’s theory; others rejected it. Many religious believers and clergy were appalled by the vision of life governed by natural rather than divine law. Some leading ministers, however, publicly supported Darwin and pointed out that evolution did not banish God. The American preacher Henry Ward Beecher wrote, I regard evolution as being the discovery of the Divine method in creation.