9. The consequences of this movement have not yet been determined upon with precision, because only a very small part of its revolution has been observed. We have only then to offer a few presumptions, some of which are, however, highly probable.
The consequence of this are:
1st- The heat and the cold alternating at the poles, and consequently the fusion of polar ice during half of the period of 25,000 years, and their new formation during another similar period; whence it must result that the poles are not destined to abide in everlasting sterility, but will enjoy in their turn the blessing of fertility.
2nd- The gradual displacement of the sea, which encroaches little by little upon the land, whilst it leaves bare other lands in order to abandon them again, and lie upon its former bed. This periodical movement indefinitely renewed would cover the whole Earth with water once every 25,000 years.
The slowness with which the seas thus operate renders it almost imperceptible to each generation; but after a few centuries it is very marked. It can cause no sudden inundation, because men retreat from it from age to age by measure as the sea advances, and they advance upon that land from which the sea retreats. It is to this cause that some wise men attribute the retreat of the sea upon certain shores, and its invasion upon others.