He studied classical and Germanic philology at the universities of Erlangen and Göttingen, where his instructors were Friedrich Christoph Dahlmann and Jacob Grimm.
[1] In 1870, he wrote his major work, volume 9 of a series entitled Geschichte der Wissenschaften in Deutschland, which was entitled Geschichte der Germanischen Philologie vorzugsweise in Deutschland.
He is cited in Konrad Duden's Die deutsche Rechtschreibung in the preface as a significant influence for this writing.
[2] In regards to historical and comparative phonology, Raumer understood the need for more specific phonetic concepts and vocabulary, and he proposed numerous refinements and clarifications in that area.
[3] He published Fortsetzung der untersuchungen über die urverwandtschaft der semitischen und indoeuropäischen sprachen (Investigations into the ancient relationship between the Semitic and Indo-European languages, 1867 et seq.).