Black-and-white engraving depicting Zipporah circumcising her son, as described in Exodus 4:25. Engraving by Georg Daniel Heumann. From Kupfer-Bibel, in welcher die Physica Sacra, oder geheiligte Natur-Wissenschafft derer in Heil. Schrifft vorkommenden Natürlichen Sachen by Johann Jakob Scheuchzer published Augsburg and Ulm: Christian Ulrich Wagner, 1731-1735.