2-Volume Slip-cased set The result of over 50 years of research, Threefoldness in Humans and Mammals is the beautiful, authorized edition of Wolfgang Schad's life's work. In chapter after chapter of this monumental two-volume work, Schad demonstrates in detail how the dynamic concept of the threefold organism--first described by Rudolf Steiner a century ago--sheds new light on aspects of mammals, including size, form, coloration,...