1 The first page of the Observationes with in the upper right the title Van Bleiswijk gave to his notes. The first case, Decisio 1, follows. The text is in Latin with in the left margin a short Dutch index IX
2 With on top a crossing out of text. A new ending has been inserted. In the crossed out text we see some corrections previously made during writing. At the bottom there is a later addition 132