However , Gelenius 's hatching system is identical only at two points with Petra Sancta , but totally the same as the one of Christophe Butkens .
Philipp Jakob Spener repeatedly quotes from Gelenius in his 1690 work titled Insignium Theoria .
Gelenius 's hatching system is identical only at two points with Petra Sancta , but totally the same as the one of Christophe Butkens .
Philipp Jakob Spener repeatedly quotes from Gelenius in his 1690 work titled Insignium Theoria .