[38 ~ 39] 글의 흐름으로 보아, 주어진 문장이 들어가기에 가장 적절한 곳을 고르시오.
38. For instance, the revolutionary ideas that earned Einstein his Nobel Prize ― concerning the special theory of relativity and the photoelectric effect ― appeared as papers in the Annalen der Physik.
In the early stages of modern science, scientists communicated their creative ideas largely by publishing books. ( ① ) This modus operandi is illustrated not only by Newton’s Principia, but also by Copernicus’ On the Revolutions of the Heavenly Spheres, Kepler’s The Harmonies of the World, and Galileo’s Dialogues Concerning the Two New Sciences. ( ② ) With the advent of scientific periodicals, such as the Transactions of the Royal Society of London, books gradually yielded ground to the technical journal article as the chief form of scientific communication. ( ③ ) Of course, books were not abandoned altogether, as Darwin’s Origin of Species shows. ( ④ ) Even so, it eventually became possible for scientists to establish a reputation for their creative contributions without publishing a single booklength treatment of their ideas. ( ⑤ ) His status as one of the greatest scientists of all time does not depend on the publication of a single book.
* photoelectric effect: 광전 효과 ** modus operandi: 작업 방식[절차]