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HE writer of the Commercial Report, at page 99 of your last Number, speaking of the Grand Junétion Canal Company, says, “The last works remaining to be executed, in order to complete their urdertaking, are the tunnel and aquedućt at Blisworth ;” but he seems not to have been aware of the extent of the works to be performed before this Company and the public can enjoy the benefits of an uninter upted navigation ; and I beg, through the medium of your Magazine, to state a few particulars relative thereto, which I have been at the pains to collect. The grand object of this canal, in connecting the metropolis by the nearest rout with the numerous canals in Warwickshire, and the other interior parts of the country, has now for a confiderable time been accomplished, though imperfectiy, by a temporary railway over the hill between Bisworth and Stoke Bruerne. The aqueduct alluded to by your Reporter, at Wolverton, near Sooney Stratford, was undertaken since the communication across that valley has been opened, by locking down into it, and up again on the opposite side, in order, by an embankment, to preserve the level, and avoid the wałe of two lockages, to which the supply of water was found inadequate. Except, therefore, the failure of the former attempt to tunnel through Blisworth-hill, and the consequent delay and expence of the railway, the I dreadful

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- For the Monthly Magazine. eEological description of south AME Rica. By the late F. A. von HUM Bo LD T.”

INCE I sent to Madrid the two first sketches of a geological delineation of South America, from the Caraccas and Nueva Valencia, I have travelled twelve hundred miles, and described a square between Caribe, Portocabello, Pimichin, and Esmeralda, a space comprehending above 59, ooo square miles; for I am not acquainted with the land between the mountain Parea and Portocabello, and between the northern coast and the valley of the Black River. In consequence of the great circumference of this district, I must content myself with delineating it in a general manner, and, to avoid details, with describing the construction of the earth, the declivity of the land, the dire&tion and inclination of the mountains, their relative ages, their fimilarity with the formation of those in Europe. These are the circumstances most necessary to be known in this science. We must proceed in mineralogy as in geography 5 we are acquainted with stones, but not with mountains; we know the materials, but we are ignorant of the whole of which they form component parts. I wish I may be able, amidst the variety of the objećts which occupy my attention during my travels, to throw any light on the structure of the earth. The laborious journeys which, for eight years, I have made through Europe had no other obj čt ; and if I have the good fortune to return to Europe, and to recover my geological manuscripts which I left behind me in France and Germany, I shall venture to give a sketch of the structure of the earth. What I have long said, that the direction and inclination, the rising and falling, of the primitive strata, the angles which they form with the meridian of the place, and with the

axis of the earth, are independent of the

direéticn and depression of the mountains; that they depend on laws, and that they observe a general parallelism which can be founded only in the motion and rotation of the earth ; what Freisleben, Von Buch, and Gruner, have proved better than I, will be found confirmed, name

* This valuable man intended to return to Europe by the way of the Manillas; but we learn, that, while he was waiting for a ship at Acapulco, he was seized with a fever, which carried hind off in a few days. His papers and journals are, however, on their way to Europe.


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