From ‘Physical Geography’ by Mary Somerville, published in its seventh edition in 1877. Image courtesy of the British Library

From ‘Physical Geography’ by Mary Somerville, published in its seventh edition in 1877. Image courtesy of the British Library

A page from Somerville’s ‘On Molecular and Microscopic Science’, published in 1869. Image courtesy of the University of California A page from Somerville’s ‘On Molecular and Microscopic Science’, published in 1869. Image courtesy of the University of California

French translation of Somerville’s ‘On the Connection of the Physical Sciences’, first published in 1834. Image courtesy of the Österreichische NationalbibliothekFrench translation of Somerville’s ‘On the Connection of the Physical Sciences’, first published in 1834. Image courtesy of the Österreichische Nationalbibliothek