Honeycombs are natural engineering marvels, using the least possible amount of wax to provide the greatest amount of storage space, with the greatest possible structural stability. Darwin recognised that explaining the evolution of the honey-bee’s comb-building abilities was essential if his theory of natural selection was to be taken seriously, and in the 1850s he carried out his own experiments at his home at Down House in Kent, and exchanged many letters on the subject. One correspondent even drew an ingenious analogy with a plum pie - you can try this at home!
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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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Cambridge University Library
Darwin's study of barnacles, begun in 1844, took him eight years to complete. The correspondence reveals how his interest in a species found during the Beagle voyage developed into an investigation of the comparative anatomy of other cirripedes and finally a comprehensive taxonomical study of the entire group. Despite struggling with a recurrent illness, he continued to write on geologicy, and published notes on the use of microscopes. Three more children, Elizabeth, Francis, and Leonard, were born during this period, but the death of Darwin's father in 1848 left the family well-provided for.
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