This is a collection of essays on the work of philosophy of Wittgenstein, where the editor seeks to present his ideas as 'one or a unity' rather than the treatment of the usual early and later works. First published in 1969, the essays span the areas of the use and reference of names, ontology and identity in Tractatus, mathematics, human beings, Wittgenstein and Strawson on others, pain and private language and Wittgenstein's look at Freud.