Yet, in order to be entirely sUl'e that, whatever hap-i de Mars, this is the one that is most actively pushing pens, the columns of the tower shall remain in a per-I forward, and the one whose state of advancement is fectly horizontal plane, we have formed a space in the the most curious to stu1y. So Messrs. Alphaud and bed plates for the reception of an 800 ton hydraulic Eiffel recently invited a number of engineers and press, by means of which the colu mn could be lifted to builders to

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... the fOllndations of the structure. the necessary height and wedged up with steeL These We were preseut on the occasion, and are in a position presses will, then, at any moment (if it ever becomes. to gh'e the readers of this journal some accurate data necessary) effect an accurate leveling of all the bearing \ as to what has thus far been accomplished. points, after the manner of an adjusting screw. 'A s well known, the tower is to be supported by four Besides the piers, we have projflcted a masonry wall metallic arches that will rest upon four masonry which will bear no load, but is designed to receive the piers. finials of the metallic mouldings that are to go on the The soil of the Champ de Mars, which has been so base of the columns. many times disturbed for the last hundred years, con-These walls are supported by pillars and arches ar-Rists of a superficial stratuIU, about twenty-four feet in ranged with their faces parallel or at right angles with thickness, composed of a filling-in of diversified ma the axis of the Champ de Mars, and forlll around each terial. Undel'lleath lies a stratum of sand and gravel base a structure 26 feet square. of the same thickness, and, finally, a stratum of clay All this infrastructure will be buried up to the level that constitutes the first layer of the geological forma of the soii, except pier 3, where a cellar will be left for the reception of the engines and generators for running the elevators. The engines will be of 500 horse-power. Atmospheric electricity will be carried off through the earth by two cast-iron pipes, 1 R inches in diameter, for