"
"But this isthmus is composed of nothing but quick sands?"
"To a certain depth. But at fifty-five yards only there is a solid
layer of rock."
"Did you discover this passage by chance?" I asked more and more surprised.
"Chance and reasoning, sir; and by reasoning even more than by chance.
Not only does this passage exist, but I have profited by it several times.
Without that I should not have ventured this day into the impassable Red Sea.
I noticed that in the Red Sea and in the Mediterranean there existed a certain
number of fishes of a kind perfectly identical. Certain of the fact, I asked
myself was it possible that there was no communication between the two seas?
If there was, the subterranean current must necessarily run from the Red
Sea to the Mediterranean, from the sole cause of difference of level.
I caught a large number of fishes in the neighbourhood of Suez.
I passed a copper ring through their tails, and threw them back into the sea.
Some months later, on the coast of Syria, I caught some of my fish ornamented
with the ring.
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