THE LEGEND OF JOHN WILKES BOOTH: MYTH, MEMORY, AND A MUMMY By C. Wyatt Evans University Press of Kansas , $24.95, 224 pages, illus. REVIEWED BY LYN NOFZIGER Was John Wilkes Booth really killed by Sgt. Boston Corbett in the barn on the Garrett farm in southern Maryland, or did he escape and spend the rest of his life as a homeless, friendless wanderer, winding up, finally, as a side show mummy in a traveling carnival? Or, on the other hand did he escape to England and die there? And the second question: Why did he murder Lincoln in the...