Hyrtl significantly enhanced the techniques of corrosion anatomy, a technique of preparing anatomical specimens invented by Frederik Ruysch. He built up a collection unsurpassed in Europe. In this work Hyrtl described a method that he invented in which he injected the blood supplies of the different organs, the adjacent parts being eaten away by acids, in order to show the finest ramifications. The technique of wax impregnation and later corrosion was also known to the Hunters. Digital facsimile from the Heidelberg University at this link