April 19 marks the 142nd anniversary of the death of evolutionary biologist Charles Darwin. The intellectual heavyweight was born on February 12,1809, the same day as fellow non-slacker, Abraham Lincoln. Unlike Abe, who was famously born in a log cabin, Darwin descended from a family of prosperous physicians and scientists. At age sixteen, Charles began his medical studies at the University of Edinburgh. He found the lectures boring and was repulsed by the sight of blood so he opted to enroll in divinity school.
Darwin became pastor of a small church where he became interested in Naturalism, a theory that related scientific method to philosophy. He had become interested in natural history while studying taxidermy at Edinburgh under the tutelage of John Edmonstone, a freed slave. When Captain Robert Fitzroy invited Darwin to serve as the naturalist on a five year voyage to South America, Charles persuaded Edmonstone to accompany him.
The Mission
Fitzroy’s ship, The Beagle visited ecologically diverse regions including Brazil, Chile and Australia. While visiting the Galapagos Islands, Darwin observed that island finches shared similarities with finches on the mainland but had modified features that allowed them to gather food easily. This inspired his supposition that evolution occurs by a process of natural selection.
The Theory
Upon returning from the voyage, the twenty-eight year old scientist formulated his theory of the origin of species. However, he was reluctant to publish his hypothesis because the British scientific community was heavily influenced by the Church of England. The theory he developed in 1837 was not made public until 1858 when he made a joint announcement with British naturalist Alfred Russel Wallace. Wallace had approached Darwin with his own theory of natural selection and Darwin did not want the other scientist taking all of the credit.
Reaction from scientists, the church and the public was extremely negative. Conventional wisdom held that species were unchanging parts of a designed hierarchy and that humans were unrelated to other animals. Nobody wanted to hear that he had descended from apes. Darwin’s professional reputation was tarnished and he described his experience as “living in Hell”. “On the Origin of Species” became a bestseller but Darwin’s theory would not become scientific doctrine until the 1930s.
The primary assertions of the hypothesis are:
- Individuals in a population vary significantly from one another.
- Much of this variation is heritable.
- Individuals more suited to the environment are more likely to survive and more likely to reproduce and leave their heritable traits to future generations, which produces the process of natural selection.
- This process results in populations changing to adapt to their environments, and ultimately, these variations accumulate over time to form new species.
- It is not the strongest of the species that survive nor the most intelligent, but the one most responsive to change.
Potpourri
Always true to scientific processes, Darwin weighed the benefits of marriage in his journal:
“ Pros: Children and Companionship
Cons: Freedom, Travel, and of course, Not forced to visit relatives”
Decision: Charles married his first cousin, Emma.
Three of their children died from illnesses and the remaining six suffered chronic poor health. Darwin knew the risks involved in marriages between cousins but estimated that hundreds of millions of the world’s unions involved two people who were related. Ultimately, Darwin blamed his children’s illnesses on the fact he married his cousin.
After returning from his famous voyage, Darwin began suffering chronic headaches and heart palpitations that would persist for the rest of his life. Some speculate that he contracted a parasitic illness that eventually led to the cardiac damage, which ultimately caused his death. To combat his illnesses, Darwin followed a strict daily schedule. This included playing two games of backgammon with Emma every night. Of course, the scientist recorded that he had won “2,795 games to her piddling 2,490.”
Darwin was honored with burial at Westminster Abbey, just a few feet away from fellow scientific heavyweight, Isaac Newton.
Although the phrase, “survival of the fittest” is usually attributed to Darwin, it first appeared in Herbert Spencer’s 1864 publication, “Principles of Biology”.
I calculate Emma’s backgammon winning percentage against the great scientist as 48.96%.
Piddling indeed!
Have a great weekend.