This class comprises letters to and from Charles Darwin, largely with family members including Horace Darwin, William Erasmus Darwin, Henrietta Litchfield, Josiah Wedgwood, but also with Thomas Henry Farrer, George Henry Lewes, Hewett Cottrell Watson and others. The class includes scraps of notes cut up and used by Darwin's children for drawings, including fragments or draft pages from manuscripts of 'Origin of species' and 'Cirripedia', and a volume of 'Insectivorous Plants' signed by Charles Darwin.