Any biography that concentrates on either Henry David Thoreau or Ralph Waldo Emerson tends to diminish the other figure, but in both men remain central and equal. Through several decades of writing, friendship remained a primary theme for them both. Collecting extracts from the letters and journals of both men, as well as words written about them by their contemporaries, Jeffrey S. Cramer beautifully illustrates the full nature of their twenty–five–year dialogue. Biographers like to point at the crisis in their friendship, focusing particularly on Thoreau's disappointment in Emerson—rarely on Emerson's own disappointment in Thoreau—and leaving it there, a friendship ruptured. But the solid seasons remained, as is evident when, in 1878, Anne Burrows Gilchrist, the English writer and friend of Whitman, visited Emerson. She wrote that his memory was failing "as to recent names and topics but as is usual in such cases all the mental impressions that were made when he was in full vigour remain clear and strong." As they chatted, Emerson called to his wife, Lidian, in the next room, "What was the name of my best friend?" "Henry Thoreau," she answered. "Oh, yes," Emerson repeated. "Henry Thoreau."