"I didn't realize there was another 'hermit' of Walden Pond " is the usual response author-historian Terry Barkley receives when he tells someone the subject of his new book. Henry David Thoreau's experiment there from 1845-1847 is widely known and immortalized in his classic Walden; or, Life in the Woods (1854). However, stresses Barkley, "Neither the world nor even most avid Thoreauvians know about Edmond Hotham's six-months at Walden Pond during...