Here are some excerpts from the front page introductory comments -
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"From 1842 Darwin lived at Down House, Downe. In 1839 he had married his cousin Emma Wedgwood, and when not devoting himself to scientific studies, he led a life of a country gentleman. In the 1840s Darwin worked on his observations of the origin of species for his own use. He began to conclude, although he was deeply anxious about the direction his mid was taking, that species might share a common ancestor. When Alfred Russel Wallace, a naturalist living in the East Indies, sent in 1858 to Darwin his study containing the main ideas of the theory of natural selection, Darwin arranged his notes, which were presented to the Linnean Society, on July 1st, 1858. They were read simultaneously with Wallace's paper, but neither Darwin or Wallace was present on that occasion."
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Click over to read the rest. I found the page while researching Primulas and this page came up because Darwin wrote about primroses in his work, "The Different Forms of Flowers on Plants of the Same Species". That link is http://www.darwin-literature.com/The_Different_Forms_Of_Flowers_On_Plants_Of_The_Same_Species/index.html
A British resource for Darwin material is at http://darwin-online.org.uk/.
There is also a Darwin Online Facebook page at http://www.facebook.com/pages/Darwin-Online/143922578989763