An extenisvely illustrated work promoting the medicinal value of the sulphur springs of Aachen and Burscheid. Blondel devoted his life to the promotion of the medicinal value of these springs, becoming inspector of the springs in 1666. Since Roman times these springs had been known to provide relief against rheumatism, gout and scrofulous disorders. This work was reprinted and translated several times in the 17th century with testimonials from German and Dutch physicians. Digital facsimile of the 1688 edition from Google Books at this link.