The Key Of The Forth: Or Historical Sketches Of The Island Of May (1858) is a book written by John Jack. The book is a comprehensive historical account of the Island of May, which is located in the Firth of Forth in Scotland. The author provides an in-depth exploration of the island's history, including its geological formation, its role in the early Christian church, its use as a military stronghold, and its importance in the fishing industry.The...