The size of the rods diminished in proportion to the depth, and as the subterranean water was not reached so soon as was expected, it became requisite five several times to enlarge the diameter of the bore, to admit of the work being successfully continued. Accidents occurred also, which tried the utmost patience of the projectors. In May, 1837, when the boring had extended to a depth of four hundred and eighteen yards, the hollow tube, with nearly ninety yards of the boring-rods attached to it, broke, and fell to the bottom of the hole, and it was necessary to extract the broken parts before any further progress could be made. The difficulty of accomplishing this may be conceived, when it is stated that the different fragments were not withdrawn until after the lapse of fifteen months. A description of the ingenious mode by which this was effected, would be too technical for our work. Again, in April, 1840, before it could be recovered, several months were spent in excavating round it. A similar occurrence created an obstacle which impeded the work for three months, but instead of being withdrawn, the detached part was driven literally into the stratum, which happened to be gravel. At length, in February, 1841, after eight years' labor, the rods suddenly descended several yards they had pierced the vault of the subterranean waters of which ;

M. Mulct had been so long in search. In the course of a few hours the water rose to the surface and discharged itself at the rate of 600,000 gallons per hour. The depth attained was six hundred and two yards. The pipe by which the water reaches the surface has recently been carried to a height, nearly on a level with the source of supply. At present the water flows into a circular iron reservoir at the top of the scaffold, and it is thence conveyed by another pipe to the ground.