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 important thinkers of the 19th century. Wallace had ideas about how animals and plants change over time, just like another famous scientist, Charles Darwin. In 1858, Wallace wrote a paper about his ideas, which helped Darwin share his own work.

Wallace travelled to many places 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 also studied how animals change and develop. He looked at how some animals have bright colours to warn others about danger. He also wrote about whether life might exist on other planets, like Mars, before many other scientists thought about it.

Besides his science, Wallace cared about fairness in society. He spoke out against 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 nature and the world.

Biography

Early life

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

Wallace’s father knew about laws but didn’t work as a lawyer. The family moved to Hertford when Wallace was five. He went to school there until he was 14. Then he moved to London to stay with his older brother John. Later, Wallace worked with his oldest brother, William, helping to measure land. During this time, he began to love learning about nature and collecting plants.

Exploration and study of the natural world

South America

Wallace wanted to travel and learn about nature. In 1848, he and another explorer, Henry Bates, sailed to Brazil. They collected insects and other animals in the rainforest and sold some to museums. 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. 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 and discovered 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 came up with the idea of evolution through natural selection on his own. He shared this idea with Charles Darwin, which led to Darwin publishing his famous book, On the Origin of Species. Wallace was influenced by earlier scientists like Jean-Baptiste Lamarck and Robert Chambers. He did a lot of fieldwork in the Amazon basin and the Malay Archipelago, which helped him understand 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 talked about how new species come from small changes in existing ones. Wallace’s ideas were very similar to Darwin’s. In 1858, he sent Darwin an essay about natural selection. Darwin, with help from Charles Lyell and Joseph Hooker, arranged for Wallace’s essay to be presented together with Darwin’s unpublished work. This was an important moment for the theory of evolution.

Wallace kept supporting Darwin’s ideas and even wrote papers to answer criticisms. He also came up with his own ideas, like the "Wallace effect," which explains how natural selection can cause species to become separate from each other. Wallace’s work is still an important part of how we learn about evolution today.

Other scientific contributions

Biogeography and ecology

In 1872, Alfred Russel Wallace began studying how animals are found all over the Earth. Friends like Charles Darwin encouraged him. At first, he worked slowly because animal groups were still being sorted out. He worked faster after 1874 when new books about animal groups were published. He made a system to study where animals live that we still use today. He looked at things like land bridges and ice ages that changed where animals live.

In 1876, he wrote a big book called The Geographical Distribution of Animals. The book showed how mountains, oceans, and plants affect 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 studied 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 on an island can change animals and plants over time.

Environmentalism

Wallace’s work helped him see how human actions can hurt nature. He worried about cutting down forests because it could damage the land, especially in rainy places. He said that clearing rainforests for farming could wash away soil and hurt the climate. He also talked about how bringing animals like goats to new places can harm plants and forests.

Astrobiology

In 1904, Wallace wrote a book called Man's Place in the Universe. He talked about whether life could exist on other planets. He thought Earth was special because it is the only place in our solar system where water can be liquid. In 1907, he wrote another book, Is Mars Habitable?. He studied Mars and showed that its climate and air were too harsh for any 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.

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.

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. He shared his ideas, but many scientists disagreed with him.

Legacy and historical perception

Alfred Russel Wallace was known for his important work in science. He led groups like the British Association and the Entomological Society of London. He was also part of respected groups such as the American Philosophical Society and the Royal Society. He received awards like the Royal Medal and the Darwin Medal.

After he died, people did not remember him well for a while. But now, more books and studies about him are being published, and people are learning more about his ideas. In 2013, events were held to honor the 100th anniversary of his death. In 2023, events celebrated the 200th anniversary of his birth, with special talks and even a drink made in his honor. Many places and animals are named after Wallace, showing how important he was to science.

Writings

Alfred Russel Wallace wrote a lot! He wrote 22 big books and at least 747 shorter works. Many of these books 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.
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