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This week's talk in our '1833' series focused on Charles Darwin's voyage on The Beagle, and was given by Mr King.
On the morning of 27 December 1831, HMS Beagle began a voyage which circumnavigated the Earth and landed at a huge variety of exotic places. Darwin collect a huge array of specimens and had them sent home along the way on board various trade ship that were encountered along the journey. The Beagle left Santiago, Cape Verde on 7 February 1832 and sailed towards Brazil, stopping for one day St Paul's rocks. Darwin went onshore
1833 While Thomas Chalmers was establishing his school at Merchiston Castle here in Edinburgh, Charles Darwin was in the area of the Tierra del Fuego while Captain Fitzroy worked on a private project. In the January of 1833 Captn Fitzroy set up a Christian Mission on Tierra del Fuego. The Beagle then set out for the Falkland Islands to survey the coast, and in April 1833 it headed North the survey the coast of Argentina. Throughout 1833 Darwin went ashore whenever possible and trekked along the coast to collect specimens. Darwin sent a third load of specimens to Revd. Henslow in Cambridge on 18 July 1833. This shipment included: eighty species of birds, twenty quadrupeds, four barrels of skins and plants, geological specimens and some fish on board a packet ship bound for England. Darwin got off the ship wherever possible and he collected specimens and took notes on virtually every fossil and living organism he encountered. These observations sowed the seeds of his theory of evolution. Darwin was amazed by the variety of organisms he encountered during his voyage. Everywhere he looked, he saw new and oddly shaped trees, exotically colored flowers and birds, and beetles and other insects. Darwin quickly realized that the diversity of living organisms was only part of the mystery of life. He found even greater numbers of fossil species. In Argentina, he discovered fossil armadillos, giant ground sloths, peculiar horses, and saber toothed cat skeletons, obviously not alive today. Darwin soon became convinced that living organisms (extant) were vastly outnumbered by extinct forms. He was convinced that extinction and the appearance of new species were real phenomena that had to be explained. T The Beagle went south again, around Cape Horn and North to survey the West coast of South America including the remote Galapagos Islands where Darwin saw how specialized the wildlife was due to its isolation from the main land. He came upon the seed of an idea that grew into the 'Theory of Evolution by Natural selection' which took the established world by storm with the publishing of the Origin of Species in 1859. Both Darwin and Wallace share credit for the theory of natural selection; however there is much more to the theory of evolution than this. Over more than 20 years Darwin amassed massive amounts of meticulously documented evidence to support his theory of "descent with modification" which can be summarized as follows:
Darwin had extreme misgivings about his theory due to his own Christian faith and lifelong indoctrination with the literal translation of the bible, but eventually his scientific instinct won and he published it. The biggest problem that many fundamentalist religious believers found hard to accept, and some still do today, is the evolution of humans from apes. This was the reaction in 1859. However, Evolution gained almost immediate acceptance by most scientists of the day and it remains the most significant law of Biology ever to have been discovered, underpinning most of modern Biology. Recent developments in DNA and molecular Biology have served to strengthen the authenticity of Darwin’s ideas with very little modification. But, evolution evidently does not have all the answers…
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