GREAT NATURAL RerAKwArEn.-We find in
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GREAT NATURAL BREAKwATER.-We find in Chambers Journal an interesting account of n great natural breakwater, formed by coral, which lines a considerable extent of the north coast of Brazll. "Those who have visited Pernambuco, can bear witness to the accuracy of the descriptions

 "It is we'll known that reefs of rock, generally coral, extend along many coasts at short distance from shore, and when concealed from the mariner or unknown to him, are frequent cause of shipwreck. Occasionally they rise far above writer 10 be easily discerned stretching for many miles with the regularity ofan artificial buwark raised for the protec- ton of the land Many of the islands which in such vast numbers stud the Pacific Ocean, are almost wholly encircled by coral belt of this description. But the coast of Brazil presents probably, the most remarkable reef to be found on the globe. Mrs. Graham, an intelligent writer on Brazil, pronounces

 it "certainy one of the wonders of the world. It is about sixteen feet in breadth at the top; the out side it slopes of more rapidly than the celebrated Plymouth breakwater, to great depth, and within it is perpendicular for many fathoms. Mir. Roster informs that it extends all along the coast from Pernambuco to Maranham, distance of nearly one thousand miles. In parts it runs very the coast, in others it recedes to "a distance from it.. Occasionally it declines in height level with the water and sinks below it but for the most part it is bold and high wall of rock, presenting at intervals numerous openings like sea-gates, where vessels may enter at all seasons, and ride from tenipests if they anchored in small lake. The harbor of Permanhuco is formed by this magnificent bulwark Mrs. Graham thus describes the entrance: We appi cached the sandy beach be- tween Recfc Cor Pernambuco) and Olinda nearly, that thought we were going to land there; when, coming abreast of d tower rock where the sea was breaking violently, turned short round, and found ourselves within natural breakwatcr, heard the surf dashng without, and the spray, but ourselves sailing along smoothly and calmly fl in a mill-pond. The reef of which the rock is formed, is said be coral, but il is coated with barnaele and lmpet that could nothing hut tle remainder of these shells for many feet down, and deep into the rock as hammers could break The breadth of the water here between the reef and the mainland, varies from few fatoms three quarters of mile. Close to the reel the water is of consider able depth, and there vessels moor in safcty."