Johann Jakob Scheuchzer published this image of a man encountering a dragon in Ouresiphoítes helveticus. The Zurich physician collected stories of Swiss dragons but considered them very dubious. From the late nineteenth century, however, this image was often reproduced to symbolize a superstition that was said to have preceded modern mountain climbers.
Source: Johann Jakob Scheuchzer, Ouresiphoítes helveticus, sive Itinera per Helvetiæ alpinas regions (Leyden, 1723), Figure X, opposite p. 395. Swi 607.23, Houghton Library, Harvard University. http://id.lib.harvard.edu/aleph/006833030/catalog