Lyman Glacier was named after William Denison Lyman by Claude Ewing Rusk , because Lyman was one of the first to describe some of the features and history of Mount Adam . Lyman Glacier was named after William Denison Lyman by Claude Ewing Rusk because Lyman was one of the first to describe some of Mount Adams ' features and history . Lyman Glacier was named after William Denison Lyman by Lyman because Claude Ewing Rusk was one of the first to describe some of Mount Adams ' features and history .