Darwin was staying in Ilkley and taking water cure treatments when On the Origin of Species was published in November 1859.
He finished working on the proofs on 1 October then travelled to Ilkley on 2 October, recording in his diary, ‘I am worn out & must have rest…’.
Darwin and his family stayed here at Wells Terrace while he took water cure treatments, which included cold water baths.
The first collected specimen of Theobroma cacao, the plant from which chocolate is made, is kept in the Museum.