During his 40 years in Europe, he wrote 19 books and declined several prestigious academic positions.
taken from:
http://www.answers.com/topic/george-santayana
Burmese Days (1934) , A Clergyman's Daughter (1935) , Keep the Aspidistra Flying (1936) , Coming Up for Air (1939) , Animal Farm (1945) and Nineteen Eighty-Four (1949)