It is at once seen, that although the original cost of logs is much cheaper than iron, yet the repairs of such logs cost as much as the first cost of iron pipes of double the capacity ; as regards economy, therefore, there can be but one opinion, and that is in favor of good iron pipes. Another from the use of logs, which is severely felt in the upper part of the city, is disadvantage the impossibility of supplying through them, as much water as the wants of the citizens require being necessarily of small diameter, and the draft on them constant, the water ;

will not rise in the upper part of the city to within twenty feet of the height of the reservoir. In cities, such as Philadelphia, where the average height of their reservoir is less than in our own city, they have an abundant supply of water, not only for domestic purposes, but in case of fire also, which I deem one of the first objects of well regulated water works. The reason of this abundant supply is obvious, as in Philadelphia they have iron pipes of capacity sufficient for all their wants. They suffered formerly at Philadelphia in the same manner as ourselves, when at one time they had six lines of wooden pipes leading their water to the city, which they finally abandoned, and substituted iron pipes of large diameter. " There have been discontinued since the city came into possession of the water works of wooden pipes, seven thousand eight hundred and seventy-one feet. Of this amount, three thousand three hundred and eleven feet have been replaced with iron pipes, and four thousand five hundred and sixty feet have been discontinued on streets where the former company had laid down iron pipes, and still continued the use of the logs.