7. Moreover, the farther you pass into any sea towards the end of
it, of that part which is shut up from the main sea, as in all those
above-mentioned, the less and less the tides rise and fall. The
like whereof also happeneth in the Frozen Sea, which proveth but
small continuance of that sea toward the east.

8. Also, the farther ye go towards the east in the Frozen Sea the
less soft the water is, which could not happen if it were open to
the salt sea towards the east, as it is to the west only, seeing
everything naturally engendereth his like, and then must it be like
salt throughout, as all the seas are in such like climate and
elevation. And therefore it seemeth that this north-east sea is
maintained by the river Ob, and such like freshets as the Pontic Sea
and Mediterranean Sea, in the uppermost parts thereof by the river
Nile, the Danube, Dnieper, Tanais, etc.

9. Furthermore, if there were any such sea at that elevation, of
like it should be always frozen throughout--there being no tides to
hinder it--because the extreme coldness of the air in the uppermost
part, and the extreme coldness of the earth in the bottom, the sea
there being but of small depth, whereby the one accidental coldness
doth meet with the other; and the sun, not having his reflection so
near the Pole, but at very blunt angles, it can never be dissolved
after it is frozen, notwithstanding the great length of their day:
for that the sun hath no heat at all in his light or beams, but
proceeding only by an accidental reflection which there wanteth in
effect.

10. And yet if the sun were of sufficient force in that elevation
to prevail against this ice, yet must it be broken before it can be