This armour resists against the outward movements created by...

This armour resists against the outward movements created by flow and ebb resulted from the gravity of the moon, too, and it is also a barrier against the great storms that disturb the calmness of the earth. Another one is the natural hinder which is between the two flows of a part of the sweet and salty water of some seas or oceans.

This unseen inviolable obstruction is not any thing but the difference of the density of the sweet water and that of the salt water which causes the water of the great rivers that comes into the sea does not mix with its salty water for a considerable length of time and,…