Arthur Koestler's publications manifest a wide range of political, scientific and literary interests. The combined edition of The Trail of the Dinosaur and Reflections on Hanging gathers some of his best-known essays and speeches. The Trail of the Dinosaur, first published in 1955, contains a great deal of Koestler's thinking for the first ten years after the war - a 'farewell to arms' as he wrote in his preface. These essays deal with the political questions that obsessed him for the best part