Walt Whitman's meditation on time is the undercurrent running through Postscripts , a series of reflections on finding one's place in the endless chain of time. In linked essays, Robert Root ranges across American terrains and landscapes including locales as varied as Walden Pond and Mesa Verde, the mountains of Montana and the coastline of Maine, Great Lakes shorelines and Manhattan on the first day of the war with Iraq. Rich in "all that retrospection,"...