Arm, hm, I checked the image of Georgius "Barschius" letter to Kircher (URL below), and he definitely signed it "Baresch", not "Bartsch" nor "Barschius". »Poof«... Sorry, again, for yet another wild delirium. All the best, --stolfi http://Brunelleschi.imss.fi.it/kircher/557/large/353v.jpg