This is the first English translation of a seminal book within the phenomenological movement. The work was orginally published in 1923 in Edmund Husserl´s yearbook Jahrbuch für Philosophie und phänomenologische Forschung, and has had a wide impact on work in phenomenology (Husserl, Heideger, Stein) and social ontology. Gerda Walther broaches the topic of social ontology, i.e., a study of social communities. She carries out this task by using the phenomenological method, that is, a study of the first-person (both singular and plural) experience of being a part of a community, what it feels like internally (and its constitutive elements), how it relates to other individuals or other communities, and how unifications between individiuals and communities or between communities take place. The book is an important contribution to the phenomenology of intersubjectivity or the study of social ontology. Social ontology has been an important and fruitful field of research in contemporary social theory, cognitive science, and other disciplines. It will be a crucial contribution to the fields mentioned.