 http://cudl.lib.cam.ac.uk/view/MS-ADD-07984/35 The volcano of Mt Osorno, Chile, from a contemporary sketch by the Beagle’s artist, Conrad Martens Cambridge University Library
Darwin experienced his first earthquake in 1834, but it was a few months later that he was really confronted with their power. Travelling north along the coast of Chile, Darwin and Robert FitzRoy, captain of HMS Beagle, were confronted with a series of violent natural events that they were perfectly placed to study.
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 Down House hothouse, engraving from Century Illustrated Monthly Magazine, Jan. 1883 Cambridge University Library
At the start of 1863, Charles Darwin was actively working on the manuscript of The variation of animals and plants under domestication, anticipating with excitement the construction of a hothouse to accommodate his increasingly varied botanical experiments, and continuing a massive scientific correspondence. Six months later the volume of his correspondence dropped markedly, reflecting a decline in his already weak health. Although Darwin worried about the effect of the quarrels on public perceptions, his theory was gathering support in influential scientific circles. He struggled with leaf angles, fractions, diagrams, and shoot dissections.
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 Charles Robert Darwin at various ages Cambridge University Library
For all his working life, Darwin used letters as a way both of discussing ideas and gathering the ‘great quantities of facts’ that he used in developing and supporting his theories. They form a fascinating collection from many hundreds of correspondents, containing diagrams and drawings, personal observations, photographs, and even specimens.
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