A secret worth knowing : a treatise on the most important subject in the world, simply to say, insanity : the only work of the kind in the United States, or perhaps in the known world, founded on general observation and truth / by G. Grimes.

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A secret worth knowing : a treatise on the most important subject in the world, simply to say, insanity : the only work of the kind in the United States, or perhaps in the known world, founded on general observation and truth / by G. Grimes. Public Domain Mark. Source: Wellcome Collection.