Like another Archimedes, he requested that the logarithmic spiral should be engraven on his tombstone, with these words, Eadem mutata resurgo.
Some curious memorials of the superstition have survived in rings and amulets, engraven with the various signs, and worn as a kind of astral defensive armour.
The Tatar zodiac is not unfrequently found engraven on Chinese mirrors in polished bronze or steel of the 7th century, and figured on the " plateau of the twelve hours "' 5 " Orat.
During his pontificate a decree against simony was engraven on marble and placed before the altar of St Peter's.
Several large object lenses, engraven with his name, are preserved at Florence.