The steam navigation of the Mississippi and the other western rivers is conducted in a manner entirely different from that of the Hudson. Every one must be familiar with the lamentable accidents which happen from time to time, and the loss of life from explosion which continually takes place on those rivers. Such catastrophes, instead of diminishing with the improvement of art, seem rather to have increased. Engineers have done literally nothing to check the evil. In a Mississippi steamboat the cabins and saloons are erected on a flooring six or eight feet above the deck, upon which and under them the engines are placed, which are of the coarsest and most inartificial structure. They are invariably worked with high-pressure steam, and in order to obtain that effect which in the Hudson steamers is due to a vacuum, the steam is worked at an extraordinary pressure. We have ourselves actually witnessed boilers of this kind, on the western rivers, working under a full pressure of 120lb. per square inch above the atmosphere, and we have been assured that this pressure has been recently considerably increased, so that it is not unfrequent now to find them working with a bursting pressure of 200lb. per square inch! As might naturally be expected, the chief theatre of railway enterprise in America is the Atlantic States. The Mississippi and its tributaries have served the purposes of commerce and intercommunication to the comparatively thinly scattered population of the Western States so efficiently that many years will probably elapse, notwithstanding the extraordinary enterprise of the people, before any considerable extent of railway communication will be established in this part of the States. Nevertheless, the traveller in these distant regions encounters occasionally detached examples of railways even in the valley of the Mississippi. In the State of Mississippi there are five short lines, ten or twelve in Louisiana, and a limited number scattered over Florida, Alabama, Illinois, Michigan, Indiana, and Ohio. These, however, are generally detached and single lines, unconnected with the vast network which we shall presently notice. To the traveller in these wild regions the aspect of such artificial agents of transport in the midst of a country, a great portion of which is still in the state of native forest, is most remarkable, and strongly characteristic of the irrepressible spirit of enterprise of its people. Travelling in the back woods of Mississippi, through native forests, where till within a few years human foot never trod, through solitudes, the silence of which was never broken, even by the red man, we have been sometimes filled with