But there is positive evidence that much of the north and east of Asia has been land since the Palaeozoic era, and it has been conclusively proved that the peninsula of India has never been beneath the sea since the Carboniferous period at least.
The letters of Budaeus show that an attempt was made by the heads of the convent or the order to check the studious ardour of these Franciscans; but it failed, and there is no positive evidence of anything like actual persecution, the phrases in the letters of Budaeus being merely the usual exaggerated Ciceronianism' of the Renaissance.
The most important positive evidence on this point indicates that the most ancient Gymnosperms were derived from the Filicales rather than from any other phylum of the Vascular Cryptogams. Extinct forms are known intermediate between the Ferns and the Cycads, and a number of these have been shown to bear seeds and must be classed as Pteridospermae.
A priori considerations suggest that they may have been akin to the Siceli, but of this at present no positive evidence can be given.
The earliest Babylonian monarch of whose presence in Mesopotamia there is positive evidence is Lugalzaggisi (before 2500 s.c.), who claims, with the help of En-lil, to have led his countless host victorious to the Mediterranean.
There is no positive evidence that the influence of new climatal conditions on the parents has any tendency to produce variations in the offspring better adapted to such conditions.