In 1856, Nahl designed this certificate of membership for the San Francisco Vigilance Committee. The graphic program shows what its members to be the essence of their city and state, and their justification for constituting the committee to discourage crime and encourage prosperity.

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The bases of California's prosperity -- mining, flanked by agriculture and shipping -- supporting industry and the arts and sciences

The bases of California's prosperity -- mining, flanked by agriculture and shipping -- supporting industry and the arts and sciences

The eye of vigilance over the angels of justice, with a ballot box between them, drive away the serpent of evil -- all hovering over "Fort Gunnybags," the Vigilance Committee headquarters in San Francisco

The eye of vigilance over the angels of justice, with a ballot box between them, drive away the serpent of evil -- all hovering over "Fort Gunnybags," the Vigilance Committee headquarters in San Francisco