The Wine of the Puritans. 1909.
The Malady of the Ideal. 1913.
John Addington Symonds--a Biographical Study. 1914.
The World of H.G. Wells. 1915.
America's Coming-of-Age. 1915.
Letters and Leadership. 1918.
The Ordeal of Mark Twain. 1919.
The History of a Literary Radical; a Biography of Randolph Bourne, 1920.