The Concept of Anxiety
The Concept of Anxiety (): "A Simple Psychologically Orienting Deliberation on the Dogmatic Issue of Hereditary Sin", is a philosophical work written by Danish philosopher Søren Kierkegaard in 1844. The original 1944 English translation by Walter Lowrie (now out of print), had the title The Concept of Dread. "The Concept of Anxiety" was dedicated "to the late professor Poul Martin Møller". He used the pseudonym Vigilius Haufniensis (which, according to Kierkegaard scholar Josiah Thompson, is the Latin transcription for "the Watchman" of Copenhagen) for "The Concept of Anxiety".
Theodor Ziehen
Ziehen published nearly 450 works on psychology, neurology, anatomy, et al. He was author of a textbook titled "Die Geisteskrankheiten des Kindesalters" (Mental Diseases of Childhood), a book that reportedly was the first systematic work on child psychiatry in Germany. He also penned "Psychiatrie für Ärzte und Studirende", a textbook that was published in four editions between 1894 and 1911. In his writings, Ziehen is credited with introducing the terms "affective psychosis" and "psychopathic constitution".