Johann Hermann Baas [ba:s] (24 October 1838 – 10 November 1909) was a German physician best known for his writings on medical history.
Baas was born in Bechtheim, in Rhenish Hesse, and studied medicine at the University of Giessen.
He graduated in 1860, and practiced medicine and ophthalmology in various towns of Rhenish Hesse.
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