In 1555 he issued his narrative ( `` Descriptio Montis Fracti sive Montis Pilati '' ) of his excursion to the Gnepfstein ( 1920 m ) , the lowest point in the Pilatus chain .
In 1555 Gessner issued his narrative ( `` Descriptio Montis Fracti sive Montis Pilati '' ) of his excursion to the Gnepfstein ( 1920 m ) , the lowest point in the Pilatus chain .