Other materials for the biography_are to be found in the incomplete Regesta edited by Joseph Cardinal Hergenrother (Freiburg-i-B., 1884 ff.); in the Turin collection of papal bulls (1859, &c.); in Il Diario di Leone X.
In the early stages of the precipitation the polarization is complete in a perpendicular direction, and incomplete in oblique directions.
After an interval the polarization begins to be incomplete in the perpendicular direction, the light which reaches the eye when the nicol is set to minimum transmission being of a beautiful blue, much richer than anything that can be seen in the earlier stages.
Its condition thus recalls the pupal instar of the higher (Endopterygote) Hexapoda; and the Thysanoptera, though few in number, are seen to be of great interest to the student, exhibiting at once a transition between the biting and the suctorial mouth, and the passage from " incomplete " to " complete " metamorphosis.