The Iroquois Ceremonial of Midwinter by anthropologist Elisabeth Tooker focuses on the major Longhouse ceremony, Midwinter. Elisabeth Tooker attended Midwinter Ceremonies from 1958 to 1966 at various Longhouses including Tonawanda, Newtown, Coldspring, Sour Springs, and the Onondaga Longhouses at New York and Six Nations. She discusses the Principles of Iroquois Ritualism including the Thanksgiving Address. The next sections describe Midwinter from various historical writings and first-hand accounts in history. The ceremony's changes during 19th and 20th centuries are then explained. This is a useful description of the important new year ceremony of the Longhouse in the United States and Canada.