The Clarence King Memoirs: The Helmet of Mambrino is a book written by Clarence King. This book is a collection of memoirs and essays that were written by Clarence King, an American geologist and mountain climber who lived in the 19th century. The book is named after one of the essays in the collection, which tells the story of a quest for a mythical helmet that was said to have the power to make the wearer invincible. The memoirs in this book cover...