In 1868 Gray had a year's leave of absence and visited Darwin in Englandthe first time they had met since they started their correspondence. Darwin had Gray in mind when he wrote, "It seems to me absurd to doubt that a man may be an ardent theist & an evolutionist." Darwin dedicated his 1877 book "The Different Forms of Flowers on Plants of the Same Species" to Gray "as a small tribute of respect and affection". One area where Darwin and Gray disagreed was Darwin's theory of pangenesis. The Grays traveled to Europe again during 1880–1881, including a final visit to Down House, Darwin's home. He spent a year in Europe this time studying. Darwin died in 1882.