Science & People

Charles Darwin | Biography, theories, books, and quotes

Let’s talk about Charles Darwin and his life. A list for the famous scientists would be incomplete without Charles Darwin who determined the theory of evolution through the mechanism he called “natural selection.” However, Darwin rarely used the word “scientist” and he never used it even for himself. He was famous for his great advances in the field of geology, but he rarely called himself a geologist; he greatly shaped our understanding of plant physiology, but he said he was not a botanist. In fact, Darwin considered himself a naturalist in the broadest sense of the word. How he questioned the wide field of studies by crossing the boundaries of different disciplines characterized and underlined his success.

Who is Charles Darwin?

Charles Darwin / The theory of evolution and natural selection
Darwin did not have a laboratory. He used the Down House in Kent where he lived with his family.

There were many factors behind Darwin’s scientific education; his father was a medical doctor, he was the grandson of the famous inventor and philosopher Erasmus Darwin by father, and the grandson of the Wedgwood Pottery founder, technologist I. Josiah Wedgwood by his mother. As they grew up in Shropshire, he and his brother were curious about chemistry and they found enough money and space to set up a lab of their own. This was Darwin’s only laboratory; he started science at home and continued it remarkably at home.

As the family’s younger son, Darwin needed a profession. There were only a few respectable options. The most obvious one was to be a doctor like his father, so he studied medicine for a while in Edinburgh. But he left the school without graduating and went to Cambridge to study in a general undergraduate degree in 1828 to work in the church—it was a common career for people in his social class. In Edinburgh, Charles had a keen interest in natural history: although he did not like the anatomy lessons and skip the class, he wrote his first known scientific work after spending hours on the beach with zoologist Robert Grant. This was an article on seaweed-like sea creature Flustra.

Darwin was a popular and harmonious student in Cambridge: he went to concerts and parties. But he was also an enthusiastic insect collector and joined the social circles of two leading academicians, both of whom played an important role in his scientific education: geology professor Adam Sedgwick and mineralogy and botanical professor John Henslow.

Charles Darwin to build his reputation

Returning home from her post-graduation field trip with Sedgwick, Darwin found her letter proposing Henslow to take part in a naval survey that will go to South America. He would join the imperial ship Beagle as a companion to the free naturalist and captain Robert FitzRoy. It was proposed for his new budding scientific talent as well as his social position and calm temperament. “He’s not yet a natural scientist,” said Henslow.

Charles Darwin traveled the world with the royal Beagle for 5 years which created his scientific career.
He traveled the world with the royal Beagle for 5 years which created his scientific career.

The ship Beagle sailed on December 27, 1831. The voyage was initially planned for two years but extended to five years. For Darwin, this was a life-changing experience. He was an inexperienced twenty-two-year-old rookie who had no long-term plans when he set off, and when he returned from his voyage around the world he was an appreciated member of the scientific institutions.

Charles Darwin’s theory about Earth’s crust

Throughout the voyage, Darwin gained practical scientific skills: observation, compilation, protection, rigorous record-keeping, classification, microscope use. He put samples of plants, birds, insects, fossils, and all kinds of sea creatures inside the crates and barrels sent them to England. These collections were important, but not unique; There were other collections in South America too. Darwin once jokingly said, “there are more Naturalists in the country, than Carpenters or Shoemakers or any other honest trade“. What distinguished Darwin from others was that he was aware of the context of what he had collected through large-scale comparisons in the geographical and chronological fields.

He traveled hundreds of miles on horseback in the And mountains and saw the evidence of almost unimaginable changes in the terrain. The fossilized trees once sunk into the water now stood in the highest passages of the mountains. When he decided to sail with a ship after an earthquake, FitzRoy showed him the evidence of slow but steady relative altitude change of the land and sea. Charles Lyell was in complete agreement with Darwin’s observations in his newly published theory claimed that the present Earth was not the result of a single major disaster, but the gradually functioning of known causes for thousands of years. He combined his observations throughout the continent on a roughly glued paper to create long geological cross-sections. The newly suggested theory was explained by giant blocks rising and descending on the melted core beneath the Earth’s crust.

New hypotheses from Charles Darwin

Although Darwin said that he blindly combines all kinds of phenomena and then draws general conclusions from them, his method was actually much more complex and ingenious than that. He especially brought together a large amount of evidence to support his printed arguments but he was never afraid to establish an ambitious hypothesis at an early stage and then look for counter-evidence to test this hypothesis. It was suggested from his notebooks that Darwin began to take note of many surprising ideas only after returning to England in October 1936, including his theory of the origin of species which he published several decades later. When he returned to England, he became famous in scientific circles, thanks to Henslow, who distributed his booklet on geology. He was now celebrated by the prominent people of the scientific world, finding many research opportunities.

Charles Darwin and Geological observations on South America.
Geological Observations on South America / 1846.

Applying the uplift and subsidence hypothesis, Darwin proposed a solution to two questions that were hotly debated in geology. One was a striking success, and the other was, in his own words, a long-lasting huge pot. Darwin was aware of the deadlock posed by ocean coral reefs. Considering that coral polyps could not live in waters deeper than sixty meters, their existence was hard to prove; Lyell recently argued that they must have grown in underwater volcano cones (mouths). However, based on the large-scale subsidence theory, Darwin suggested that corals first formed in shallow waters around the islands and then followed the gradual collapse of the islands within generations. This elegant solution guaranteed Darwin to be among the prominent scientists. When he returned to England, he elected as a secretary to the Geological Association in March 1883, and he quickly started to evaluate the possibility of a university career.

Charles Darwin and a biographical sketch of an infant

Darwin had now turned his attention to a series of stunning terraces stretching around the Great Glen valley system called “parallel roads” in Glen Roy, on the mountainous terrain of Scotland. Geologists argued that the valleys, which were once thought to be man-made, previously contained lakes, and the lowering and rising waters carved these roads. But there was no trace of the huge dam sequence implied by this theory. Darwin suggested that the seawater, which was discharged as the landmass increased must be the reason. But this was also problematic as there was not a trace of sea creature fossils. Shortly after it was published, Louis Agassiz opposed Darwin’s theory with the argument that these large dams were made of ice from the Ice Age. This was a lesson for Darwin to be more prudent for what he had made public.

Shortly after his field trip to Glen Roy, Darwin was elected a member of the Royal Society in January 1839. Five days later, she married her cousin Emma Wedgwood, and soon their first child was born in December of the same year. Darwin, who was always an observer, recorded all aspects of his son William during his infancy. He used his notes for the first time in his book The Expression of the Emotions in Man and Animals and later in his article “A biographical sketch of an infant” published in Mind, a psychology publication founded in 1877.

The evolution of evolutionism

In 1842, Darwin and his family moved to the village of Downe near the city. It was extremely well calculated that it was close enough to sustain professional and personal ties to London, but far enough to deter unwilling guests. For the rest of his life, this place became his home and workplace. His wife and children provided the loving and stable life he needed. Now Darwin was a prominent writer who proved himself with his best-selling book about his Beagle voyage. He also had a chronic illness. Nevertheless, he made a very important friend both personally and professionally.

Kew is still one of the most important botanical buildings in the world today
Kew is still one of the most important botanical buildings in the world today.

The young botanist and explorer Josef Hooker, who would be the manager of the Royal Botanical Garden in Kew, was appointed to identify Darwin’s Beagle plant specimens. They started a correspondence and for the next forty years Hooker became the touchstone of Darwin’s ideas. Darwin was now settled and all the amateur and professional scientists around the world who wanted to share their findings with Darwin about plants, animals, and people were only allowed to talk with Hooker. This included explorers, diplomats, and those who settled in a colonial land. Hooker would be one of the few people that Darwin shared his theory about the diversity of organic life and how all living things came from a single common ancestor. Darwin had been developing this theory since the 1830s.

Darwin’s new profession: Ecologist

During his voyage on the Beagle, Darwin became increasingly aware of the difficulty of distinguishing between different species and variants, the surprising similarity of many extinct fossils and existing creatures, and the precise harmony of many organisms to their environment. The idea that species may transform overtime was a matter of disagreement, but not new; French biologist Jean-Baptiste Lamarck suggested that the beneficial properties acquired by one generation could be passed on to the next generations. Authors like William Paley explained that this harmony was a result of the divine design in nature.

During his journey around the world, Darwin encountered an enormous natural diversity of even explicit relatives. On his return to England, he explored dog and pigeon breeders, observing the dramatic change in the characteristics of pets that could be produced in just a few generations, guided by the naturally occurring diversity. Thomas Malthus’s Essay on the Principle of Population study, which explains how a population growth is limited to the point of competition for resources gave Darwin the piece he needed to draft his new theory.

He argued that any trait that would help an individual survive enough to give birth, be it animal, plant, bird, or human, would be transferred to subsequent generations disproportionately. This principle of “natural selection” was true for all physical traits, whether it was coloration for camouflage, the ability to fight or escape, or the ability to access food sources that others could not reach.

With this mechanism, Darwin realized that all the populations, like finches that he collected from different islands in the Galapagos, even though John Gould’s subsequent work clarified this, could adapt to local conditions. Given enough time, the offspring of such organisms could diversify, occupy different environmental niches, and evolve into new species. Although the word “ecology” was not available in English until 1876, Charles Darwin was already an ecologist in many respects.

The birds coming from Malaysia

The life of Charles Darwin, Charles Darwin and Alfred Russel Wallace.
Charles Darwin and Alfred Russel Wallace

The way things went with geology, also happened with biology: Darwin’s whole research program was shaped through the bird species once he outlined the global theory. Even the eight-year taxonomy study he conducted on living and fossil rock mussels, which was finally published in 1851, was actually a conformity study if it is considered in the light of his main theory. While working on mussels, Darwin was working on a new book called Natural Selection, which would never be published, that he was collecting data from all areas of natural history, mostly through the growing network of correspondence.

One of them was a naturalist and commercial collector Alfred Russel Wallace, who sent bird samples from Malaysia to Darwin in late 1856. They both knew they shared similar ideas. Darwin told Wallace that he plans to publish a book on the species problem. Except for some chapters of this big book, they had drafts explaining almost all the theory, one of which was previously written in 1842 and one in 1844. In 1858, Wallace accelerated the publication of Darwin’s theory by sending him a text that is suggesting a similar mechanism to his idea of evolution of species.

Fearing that he would lose his priority in the publication, but also distracted by two of his children having serious illnesses, Darwin sent Wallace’s text to Charles Lyell as requested. Lyell and Hooker arranged for both Wallace’s text and Darwin’s loosely written text to be read at the meeting of the Linnean Society. Darwin was destroyed by his baby son’s death, so he was not there. Almost nobody noticed his article, but Darwin did not give up. He quickly expanded the original text with materials from his main book and completed his book “On The Origin of Species by Means of Natural Selection” in less than a year. Contrary to Wallace, Darwin had a social position, scientific reputation, and a depth in the knowledge that would allow him to be taken seriously in his new book. This book was the biggest breakthrough in the life of Charles Darwin.

His creative experiments

Darwin did not end his career with the publication of the Origin of Species. Although he suffered from chronic disease attacks, he was only fifty years old and most of his books had not been published yet. He still had no theory of how heredity works. Gregor Mendel developed this theory, now called genetics, in the 1860s. But his work was not understood until Darwin’s death, nor Darwin ever heard of Mendel’s work.

Ten years after the Origin of Species, he published his extensive two-volume work The Variation of Animals and Plants under Domestication, which resulted in Darwin’s description of the hypothetical mechanism of inheritance he called “pangenesis“. He argued that particles circulating in body fluids that could pass from parents to children, namely sediments, act as catalysts for the development of certain organs. But few were convinced and neither did his cousin Francis Galton’s experiments with blood transfusions produce any supporting evidence.

darwin's Pangenesis and pigeon varieties.
Pangenesis and pigeon varieties.

The next two books, The Descent of Man, and Selection in Relation to Sex, and The Expression of the Emotions in Man and Animals were written to show that some human-appearing dimensions such as aesthetic sensibility, conscience, and even religious feelings might be the part of the evolutionary continuity in the rest of the animal kingdom. The natural selection mechanism was complemented by sexual selection—organisms should not only live long enough to give birth, but should have characteristics that would most appeal to them, and these features pass over to the next generations. However, Darwin’s main struggle was not people or even animals, but plants. He saw humans only as a distinct variety of primates, but there were no strict boundaries between animals and plants. He did creative experiments in his garden and his conservatory in Down, that is examining hybrid crossing and thus the harmonies assure greater diversity. He studied plants that are showing animal-like behaviors—such as vines or insect-eating plants that are sensitive to external stimuli.

Charles Darwin’s last book

Though he was criticized later in his life for the amateur-looking nature of his working methods, Darwin was a skilled experimenter and by no means away from the advances of science. He was also in contact with the university laboratories established in Germany, thanks to his botanist son Francis who conducted experiments for him. He examined the importance of regulating the habitat for the cultivation of seeds which brought from one end of the world elsewhere. He pioneered the use of scientific surveys and signed petitions submitted to parliament on matters affecting science in public life.

Darwin’s latest book, The Formation of Vegetable Mold through the Action of Worms, published in 1881, was a return to the line of investigation that began decades ago and was the result of experiments he made with his children at home. It was also a pioneer work in showing the importance of seemingly insignificant creatures as well as the full cycle of nature in a wider environment. Darwin saw his last book sold more than all of his previous books, and the next year Charles Darwin’s life ended. Due to his revolutionary scientific ideas and fame, he was buried in a magnificent funeral at Westminster Abbey in London.

Charles Darwin quotes

  • “A man who dares to waste one hour of time has not discovered the value of life.”
  • “If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once every week.”
  • “Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science.”
  • “If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.”
  • “The love for all living creatures is the most noble attribute of man.”
  • “We stopped looking for monsters under our bed when we realized that they were inside us.”
  • “I am not apt to follow blindly the lead of other men”
  • “The highest possible stage in moral culture is when we recognise that we ought to control our thoughts.”
  • “The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic.”
  • “An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.”
  • “Blushing is the most peculiar and most human of all expressions.”
  • “I see no good reasons why the views given in this volume should shock the religious views of anyone.”
  • “I gradually came to disbelieve in Christianity as a divine revelation.”
  • “I can indeed hardly see how anyone ought to wish Christianity to be true; for if so the plain language of the text seems to show that the men who do not believe, and this would include my Father, Brother and almost all of my friends, will be everlastingly punished. And this is a damnable doctrine.”