This volume contains the translations of Katha, Isha, Kena, and Mundaka Upanishads. It also contains two introductory chapters dealing with the historical background, the metaphysics, and the psychology of the Upanishads. Of this volume the Contemporary Review wrote: ‘Swami Nikhilananda has rendered us an unforgettable service. The scholar and the student will certainly find himself fully repaid by a study of this remarkable edition.’