Image: Hans von Gersdorff Feldtbüch der Wundartzney Illustration from a book by a medieval surgeon Hans von Gersdorff, depicting urine examination. image by io9.com/Cyriaque Lamar
Image: Hans von Gersdorff Feldtbüch der Wundartzney Illustration from a book by a medieval surgeon Hans von Gersdorff, depicting urine examination. image by io9.com/Cyriaque Lamar