Thayer Expedition

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This side consists of a native granite rock, which is 365 palms [about 250 feet] high above the surface of the water, and having still 120 palms of depth. F * I regret not to be able to give a better view of these falls, but the photo- graph from which it was drawn was not a good one. I am assured, however, it gives a better idea of the falls than any other sketch yet published.
1 " Resserre entre deux immenses murailles de pierre, il coule d'abord en torrent et sur un fond dont la declivite ac
...croit la vitesse, puis tout a coup il se prdcipite en trois chutes consecutives dont la hauteur re'unie et de 84 metres.
416 GEOLOGY AND PHYSICAL GEOGRAPHY.
"The impetus with which the waters precipitate themselves against this wall makes them constantly ascend and descend from the point of contact with the rock. On the right they descend in a right angle to the bed of the river below ; but to the left, as they have no way of egress, they produce, in consequence of their advancing and retiring movement, a come-and-go like the waves of the sea on the shores, from which has resulted, for thousands of years up to the present time, not only the wearing away of the rock, and the formation of a little bay, but even of a cavern in the rock, which is 444 palms in length, and whose mouth is 80 palms high and 40 broad, divided in the interior into two great halls, the dwelling-place of thousands of bats, and for this reason called Furna dos Morcegos "The rock in which ihiafurna is formed, as well as in all the ex- tension of the Cachoeira, is of the hardest granite, of a fine grain, and in truth it is incomprehensible how it should be possible for the waters to form such a cavern in a rock of so great hardness.


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