Maria Graham, Lady Callcott, was a British writer of travel books and children's books, and also an accomplished illustrator.
Maria, Lady Callcott by Sir Thomas Lawrence
Maria Callcott, painted by her second husband, Sir Augustus Wall Callcott.
Dragon Tree & Peak of Teneriffe. Drawing by Maria Callcott in her book Journal of a Voyage to Brazil, published 1824
Laranjeiras outside Rio de Janeiro 1821. Drawing by Maria Callcott in Journal of a Voyage to Brazil.
George Bellas Greenough FRS FGS was a pioneering English geologist. He is best known as a synthesizer of geology rather than as an original researcher.
Maria Graham
…Lyell, as evidence in support of his theory that mountains were formed by volcanoes and earthquakes. Four years later the president of the Society, George Bellas Greenough, decided to attack Lyell's theories. But instead of attacking Lyell directly, he did it by publicly ridiculing Maria Callcott's observations. Maria…
General Sketch of the Physical and Geological Features of British India (1855)
The grave of George Bellas Greenough, Kensal Green Cemetery