Extensive experiments have been made, and are still being made, in reference to the advantage storing raw water for some considerable time (i.e. two or three! months) before filtering. Sir Alexander Houston, Director of! highly satisfactory results, and no further trouble has occurred. The water engineer with modern knowledge and inventions at his disposal] in selecting a site for new works, or in deciding how to deal with a works which is producing impure water, now asks himself "Is it practical to deal with a "source of supply nearby that is known to be contaminated?
"By filtration, sterilization, or both?
"Or is it advisable to go to a source at a very considerable distance which 1s known to be pure, thereby spending a very considerable sum of money?
"Ts it certain that this latter source wil] remain uncontaminated?"
There is another branch of water engineering, where the present day has the advantage over the ancient times, at least after pipes were laid into men's houses, i.e. detection of waste by means of meters and
Text read from the printed page and cleaned; old type leaves the occasional error.