Collection contains a 4-page letter (7 March 1873) Whipple wrote to Jeremiah Hacker, a Maine reformer, abolition advocate, journalist, and publisher of "The Pleasure Boat." Whipple mentions an article Hacker wrote for "The Voice of Peace," as well as his admiration for "The Pleasure Boat" and "N.P. Rogers' Newspaper Writings." He also discusses his difficulty printing "The Voice of Peace," and the increase in pacifism since the end of the Civil War, noting that abolitionists and industrialists Adin Ballou and E. D. Draper were constant in their support of peace, while members of the utopian Hopedale Community were "untrue to the professions of years." Whipple included a printed photograph with his letter.