Letter from Mary Somerville to John Murray, 26 October 1866 [Library reference: MS.41131].
Mary Somerville was still involved in writing and publishing even near the end of her life.
Her last book, published by John Murray when she was aged 89, was entitled: 'On Molecular and Microscopic Science'.
Throughout her life, Somerville was concerned about keeping up-to-date with the latest theories.
In this letter of 1866 to Murray, she mentioned some of the people she hoped to contact, including Charles Darwin.