National Geographic : 1933 Aug
BEYOND THE GATE LIE VINEYARDS One may step from busy streets through the Schwabentor into this rustic setting. Next to its trees, its vines constitute the principal source of revenue of the Black Forest. The monks were the first to plant vineyards in the Freiburg district (see text, page 236). Photograph by E.Baumgartner BROTHER BERTHOLD, OFTHE BLACK ARTS German writers acclaimhim theinventor ofgunpowder, though Roger Bacon also has been credited with thediscovery. While experimenting in his cell in Barefoot Cloister, which stillstands, heexploded hisretort with a mixture that he later developed into acharge forfirearms (seep.222).