Sr. Gorgoza, a Granadian, represents that he has passed over this line, and found an altitude of one hundred and ninety feet. How this elevation was determined without a barometer or spirit-level is not clear. This part of the Isthmus is referred to in general terms by Humboldt, Fitzroy, and Trautwine, but as these authorities echo each other, the inference derives little additional strength from their concurrence. ATRATO. Taking leave of the Darien surveys, the explorations in the province of Chócó come next in order. Under this head are included the surveys made in the valley of the Atrato. Success appears to have accompanied these operations, as disaster followed the Darien expeditions. The hopes centering in any one Isthmean route have been in the inverse ratio of the information concerning them. The indispensable desiderata of a summit of moderate elevation, and deep harbors, have not yet been found existing conjointly together. The volcanic agency which hollowed out deep basins where ships may securely anchor, has, at the same time, given unusual altitude to the dividing ridge. Shallow harbors and low divides, and deep harbors and great altitudes, accompany each other with the persistence of a law. As the explorations dissipated the hope of one route, another was taken up. Vague rumors continually reach us similar to those we have already encountered. One of the latest of these is this: A Mr. or Sr. Gorgoza, a resident of New Granada, has found a short and easy transit across the Cordillera, between the Gulf of San Miguel and Urabà (or Darien), by ascending the Tuyra, and crossing the valley of the Atrato. According to his statement, the depression in the divide is not more than 190 feet above the mean tide, and the distance between head waters, navigable by canoes, is not more than three miles. DE LA CHARME ROUTE—BY THE WAY OF TUYRA, PAYA, AND CAQUARRI TO THE ATRATA. The March number of _Putnam’s Monthly_ contains a description of a route surveyed by M. De La Charme, which occupies a position between the Darien routes, and the line between Humboldt Bay and the Atrato, surveyed by Lieut. Michler. The article referred to gives an account of what appears to be the latest reconnoissance made in that region, and claims for its author, M. De La Charme, “the right of discovery.” Of this survey Sr. De Gorgoza is the patron and prime mover.