Alfred Russel Wallace

Alfred Russel Wallace (8 January 1823 – 7 November 1913) was an English naturalist, explorer, geographer, anthropologist, biologist and illustrator. He was one of the great thinkers of the 19th century. Wallace thought about how animals and plants change over time in the same way as another famous scientist, Charles Darwin. In 1858, Wallace wrote a paper about his ideas, and this helped Darwin share his own work with the world.

Wallace travelled far and wide to study nature. He explored the Amazon River basin and later the Malay Archipelago. In the Malay Archipelago, he noticed a clear divide in the kinds of animals living there. This divide is now called the Wallace Line. It shows how animals in the western part are mostly from Asia, while animals in the east are from Australasia. Because of his work, Wallace is often called the "father of biogeography" or "zoogeography".

Wallace did not just study animals. He also thought deeply about how they change and develop. He studied how some animals have bright colours to warn others about danger. He also wrote about whether life might exist on other planets, like Mars, long before many other scientists thought about it.

Besides his science, Wallace cared deeply about fairness in society. He spoke out against what he saw as unfair treatment of people in Britain. Even though some of his ideas, like his belief in spiritualism, were unusual for scientists at the time, he remained a respected thinker who wanted to understand both nature and the world around him.

Biography

Early life

Alfred Russel Wallace was born on 8 January 1823 in Llanbadoc, Monmouthshire. He was one of nine children in his family. His father came from Scotland, and his mother was English. Wallace’s family liked to say they were related to William Wallace, a famous leader from Scotland who fought for independence long ago.

Wallace’s father knew about laws but never worked as a lawyer. The family moved to Hertford when Wallace was five, and he went to school there until he was 14. Then he moved to London to stay with his older brother John, who was learning to be a builder. Later, Wallace worked with his oldest brother, William, helping to measure land for building projects. During this time, he started to love learning about nature, collecting flowers and plants.

Exploration and study of the natural world

South America

Wallace wanted to travel and learn about nature, just like famous explorers before him. In 1848, he and another explorer, Henry Bates, sailed to Brazil. They collected insects and other animals in the rainforest, selling some to museums to help pay for their trip. Wallace spent many years exploring rivers and forests, learning about the plants, animals, and people there.

One day, Wallace’s ship caught fire and all his collections were lost. But he saved some notes and sketches, and after returning home, he wrote books and articles about his adventures.

East Indies

After Brazil, Wallace traveled to places now known as Singapore, Malaysia, and Indonesia. He collected thousands of insects and other specimens, discovering many new species. During this time, Wallace had an important idea about how animals change over time, which he shared with Charles Darwin.

Return to Britain, marriage and children

In 1862, Wallace returned to Britain. He later married Annie Mitten, and they had three children together.

Financial struggles

Wallace worried about money for his family. He made some bad investments and needed to earn money by writing and giving lectures. Friends helped him, and later he received support from the government for his work in science.

Social and political activism

Wallace cared deeply about fairness and helping people. He spoke out against unfair treatment of workers and supported ideas that lands should be shared more equally. He also believed that women should have the right to vote.

Further scientific work

Wallace continued to write and give talks about nature and evolution. He traveled to the United States, where he met other scientists and learned more about plants and animals.

Death

Wallace passed away at home on 7 November 1913, at the age of 90. People remembered him as a great thinker who helped change how we understand the natural world.

Specimens and illustrations

Arenga pinnata sketched by Wallace in Celebes, reworked by Walter Hood Fitch Wallace collected many specimens, such as this Mino anais anais from South West Papua, 1863. An illustration from The Malay Archipelago depicts the flying frog that a workman handed to Wallace.

Theory of evolution

Alfred Russel Wallace was a naturalist who independently developed the theory of evolution through natural selection. He shared this idea with Charles Darwin, which led to Darwin publishing his famous work, On the Origin of Species. Wallace believed in the transmutation of species, influenced by earlier scientists like Jean-Baptiste Lamarck and Robert Chambers. His observations during fieldwork, especially in the Amazon basin and the Malay Archipelago, helped shape his understanding of how species change over time.

In 1855, while working in Sarawak on the island of Borneo, Wallace wrote a paper called "On the Law which has Regulated the Introduction of New Species." This paper introduced what later became known as the "Sarawak Law," suggesting that new species arise from small changes in existing ones. Wallace’s ideas were similar to Darwin’s, and in 1858, he sent Darwin an essay outlining natural selection. Darwin, with the help of scientists Charles Lyell and Joseph Hooker, arranged for Wallace’s essay to be presented alongside Darwin’s unpublished work. This joint presentation marked a key moment in the history of evolutionary theory.

Wallace continued to support and defend Darwin’s ideas, even publishing papers that countered criticisms. He also made his own contributions, such as proposing the "Wallace effect," which explains how natural selection can lead to reproductive isolation between species. Wallace’s work remains an important part of the story of how we understand evolution today.

Other scientific contributions

Biogeography and ecology

In 1872, Alfred Russel Wallace started studying how animals are spread across the Earth, encouraged by friends like Charles Darwin. He worked slowly at first because animal classifications were changing. He worked harder after 1874 when new classification books came out. He expanded a system for birds to include mammals, reptiles, and insects, creating the basis for how we study animal regions today. He looked at things like land bridges and ice ages that affected where animals live.

He published a big book in 1876 called The Geographical Distribution of Animals. It showed how mountains, oceans, and plants influence where animals are found. The book also used fossils to explain how animals moved and changed over time. For example, he talked about tapirs that originally lived in the Northern Hemisphere but later moved to South America.

In 1880, Wallace wrote another book called Island Life. He looked at how animals and plants live on islands. He described islands that formed in the ocean, like the Galápagos and Hawaiian Islands, and islands that were once part of continents, like Britain and Madagascar. He explained how being isolated on an island can change animals and plants over time.

Environmentalism

Wallace’s work showed him how human activities harm nature. He worried about cutting down forests and how it could damage the land, especially in places with a lot of rain. He said that clearing rainforests for farming could make the soil wash away and hurt the climate. He also talked about how introducing animals like goats to places where they don’t belong can destroy plants and forests.

Astrobiology

In 1904, Wallace wrote a book called Man's Place in the Universe, where he discussed whether life could exist on other planets. He thought Earth was special because it was the only place in our solar system where water could exist in liquid form. Later, in 1907, he wrote another book, Is Mars Habitable?, where he disagreed with ideas that there were canals on Mars built by intelligent beings. He studied Mars’s climate and atmosphere and showed that conditions there were too harsh for liquid water or any kind of advanced life.

Other activities

Alfred Russel Wallace had many interests beyond his main work on nature and evolution. He was interested in an old idea called phrenology and tried experiments with hypnosis, which was known back then as mesmerism. He believed that what he saw during these experiments connected to spiritualism, a belief that some people could talk to spirits.

Wallace also took part in a famous argument about whether the Earth was flat or round. Someone challenged him to prove the Earth was round, and Wallace did an experiment using objects placed far apart along a canal. He showed that the Earth had a curve, but the person did not want to accept it and caused a lot of trouble for Wallace.

Later, Wallace spoke out against a law that made people get a vaccine to prevent a sickness called smallpox. He thought people should choose for themselves and believed the vaccine might not always work as well as others said. He shared his ideas, but many scientists disagreed with him.

Legacy and historical perception

Alfred Russel Wallace was recognised for his important work in science and society. He held leadership roles in groups such as the British Association and the Entomological Society of London. He was also elected to respected organisations like the American Philosophical Society and the Royal Society, receiving awards such as the Royal Medal and the Darwin Medal.

After he passed away, Wallace was not well remembered for a time. But recently, more books and studies about him have been published, and people are learning more about his ideas. In 2013, events were held around the world to celebrate the 100th anniversary of his death, including unveilings of portraits and statues. In 2023, events marked the 200th anniversary of his birth, including special talks and even a cocktail made in his honour. Many places and species are named after Wallace, showing how much he meant to science.

Writings

Alfred Russel Wallace wrote a lot! In 2002, a science historian counted that he wrote 22 big books and at least 747 shorter works. Many of these were about nature and how animals and plants change over time. Some were about society and people, and a few were about ideas like spirits and the mind.

When scientists talk about plants he studied, they use the name “Wallace” to show he was the one who wrote about them.
Main article: Author citation (botany)