Charles Darwin: An Illustrious Naturalist
Darwin and Theory of Natural Selection
Father of Ecology
1 Birth and parentage of Charles Darwin
2 His disgust for medicine
3 Dan/Vin as a theologists
4 His scientist inclination
5 His visit of various countries and history of coral reefs
6 His experiments on tortoise and their effects on islands
7 His fame as a naturalist and his publications
8 Darwin’s anxiety about the origin of species
9 Darwin – mentally at conflict
10 The Origin of Species and by Means of Natural Selection and the Controversy it arose
11 Defense of Dan/van’s theory
Charles Dan/vain was born‘in Shrews bury, Shropshire. He was the son of Robert Warring Darwin and his wife Susannah, and the grandson of the scientist Erasmus Dam/in. His mother died when he was eight years old, and he was brought up by his sister. He was taught the classics at Shrews bury, then sent to Edinburgh to study medicine, which he hated. Like many modern students Darwin only excelled in subjects that intrigued him. Although his father was a physician, Darwin was uninterested in» medicine and he was unable to stand the sight of surgery. He did eventually obtain a degree in theology from Cambridge University, although theology was of minor interest to him also. What Darwin really liked to do was tramp over the hills, Observing plants and animals, collecting new specimens, scrutinizing Their structures, and categorizing his endings, guided by his cousin William Darwin Fox, an entomologist.
Darwin’s sciatic inclinations were Encouraged by his botany professor, John “Stevens Henslowe, who was Instrumental, despite heavy paternal opposition, in securing a place for Dan/vine as a naturalist on the surveying expedition of HMS Beagle to Patagonia. Under Captain Robert Fitzroy, Darwin visited Tenerife, the Cape Verde Island, Brazil, Montevideo, Buenos Aires, Chile, the Galapagos Islands, Tahiti, New Zealand, and Tasmania. In the Cape Verde Island Darwin devised his theory of coral reefs. ‘
Another signiﬁcant stop on the trip was in the Galapagoslslands, it was here that Darwin found huge populations of tortoises and he found that different islands were home to significantly different types of tortoises. Dan/vin then found that on islands without tortoises, prickly pear cactus plants grew with their pads and fruits spread out over the ground. On islands that had hundreds of tortoises, the prickly pears grew substantially thick, tall trunks, bearing the pads and fruits high above the reach of the tough mouthed tortoises. During this five-year expedition he obtained intimate knowledge of the fauna, ﬂora, and geology of many lands, which equipped him for his later investigations. In 1836, Darwin returned to England after the 5 years with the expedition, and by 1846 he had became one of the foremost naturalists of his time, and he also published several works on the geological and zoological discoveries of his voyage.
He developed a friendship with Sir Charles Lyell, became secretary of the Geological Society, ‘a position which Dan/vin held for four years. In 1839 Dan/vin married his cousin Emma Wedgwood. But constantly bothering Darwin was the problem of the origin of the species. Darwin sought to prove his ideal of evolution with simple examples. The various breeds of dogs provided a striking example of what Darwin sought to prove. Dogs descended from wolves, and even today the two will “readily crossbreed. With rare exceptions, however, few modern dogs actually resemble wolves. Some breeds, such as the Chihuahua and the Great Dane, are so different from one another that they would be considered separate species in the wild. lf humans could cross breed such radically different dogs in only a few hundred years, Darwin _reasoned that nature could produce the same spectrum of living organisms given the hundreds of millions of years that she had been allowed. From 1842 Darwin lived at Down House, a country gentleman among his gardens, conservatories, pigeons, and fowls.
The practical knowledge he gained there, especially in variation and interbreeding proved invaluable. At Down House Darwin addressed himself to the great work of his life, the problem of the origin of species. After ﬁve years of collecting the evidence, Darwin began to speculate on the subject. ln 1842 he drew up his observations in some short notes, expanded in 1844 into a sketch of conclusions for his own use. These conclusions were the principle of natural selection, the germ of the Darwinian Theory, but with typical caution he delayed publication of his hypothesis. However, in 1858 Alfred Wallace sent Darwin a letter of his book, Malay Archipelago, which, to Dan/vin”s surprise, contained the main ideas of his own theory of natural selection. Lyell and Joseph Hooker persuaded him to submit a paper of his own, based on his 1844 sketch, which was read simultaneous sly with Wallace’s before the Linnaean Society in 1858.
Neither Dan/vin nor Wallace was present on that historic occasion. Darwin then set to work to condense hisvast mass of notes, and put into shape his great work, The Origin of Species by Means of Natural Selection, or the Preservation of Favored Races in the Struggle for Life, published in 1859. This great work, received throughout Europe with the deepest interest,‘ was violently attacked because it did not agree with the account of creation given in the Book of Genesis. But eventually it succeeded in obtaining recognition from almost all biologists. ‘ Darwin, contrary to popular belief, never said that human beings evolved from apes. He said that all life began as a primordial soup, with molecules acting on each other.
So from the ﬁrst single celled organism all life came. One single organism, when acted on by several different molecules could give rise to many different species of animals. lt is in this way that he stated that Ape and man were similar…each having a Similar life’s beginning. Darwin died after a long illness, leaving eight Children, several of whom achieved great distinction. Though not the sole Originator of the evolution hypotheses, or even the ﬁrst to apply the Concept of descent to plants and animals, Darwin was the ﬁrst distinction Thinker to gain for that theory a wide acceptance among biological Experts. By adding to the crude evolutionism of Erasmus Darwin, Lamarck, and others, his own specific idea of natural selection, Darwin Supplied a sufficient cause, which raised it from a hypothesis to a veritable theory.
“A man, who dares to waste an hour of life has not discovered the value of life. ”