It is a circumstance specially fortunate for the future development of Siberia that its three great rivers are already navigable for the greater part of their course. The Ob is navigable from Biisk (52-1/2 deg. N.L.), and the Irtisch at least from Semipalitinsk (50 deg. 18' N.L.). The Yenesej, again, which, after leaving the region of its sources in China, crosses with its two main arms the whole of Siberia from north to south, from the forty-sixth to the seventy-third degree of latitude, and thus traverses a territory which corresponds in length to the distance between Venice and the North Cape, or between the mouth of the Mississippi and the north part of Lake Winnipeg, and is already navigable by nature from the sea to Yenisejsk. To this town goods are already transported _down_ both the main arms from Minusinsk and the region of Lake Baikal. It is said that the Angara might be made quite navigable during its whole course at an expenditure trifling in comparison with the advantages that would thus be gained, as well as its continuation, the Selenga, in its lower part between the Chinese frontier and Lake Baikal. In this way a river route would be opened for the conveyance of the products of North China and South Siberia to a sea which an ordinary steamer would cross in five or six days to the White Sea or the North Cape. A similar communication with the Atlantic may be opened on the double river Ob-Irtisch with Western Siberia and High Asia as far as to Chinese Dsungaria, where the Irtisch begins its course as a small river, the Black Irtisch, which falls into Lake Saisan, and rises south of the Altai Mountains in the neighbourhood of the Selenga, the source-river of the Yenisej. At several places the river territories of the Ob and the Yenesej nearly reach hands to one another through affluents, which rise so close to each other that the two river systems might easily be connected by canals. This is also the case with the affluents of the Yenesej and the Lena, which at many places almost meet, and the Lena itself is, according to Latkin's statement, navigable from the village of Kotschuga to the sea. We see from this how extraordinarily advantageous is the natural system of interior communication which Siberia possesses, and at the same time that a communication by sea between this country and the rest of the world is possible only by the Arctic Ocean. It is on this that the enormous importance of the navigation of the Siberian Polar Sea depends. If this can be brought about, Siberia, with an inconsiderable expenditure in making canals, will not only become one of the most fortunate countries of the globe in respect of the possibility of the cheap transport of goods, but the old proposal of a north-eastern commercial route to China may even become a reality. If, on the other hand, navigation on the Polar Sea be not brought about, Siberia will still long remain what it is at present--a land rich in raw materials, but poor in all that is