AMERICAN WATERWORKS ASSOCIATION. The twenty-first auuunl convention of the American Waterworks association will be held in Manhattan, city of New York, during the week beginning Juue 17 next. It is expected there will be a large attendance present, as very valuable papers will lie read and discussed, and the entertainment committee will see that the amusement of the members and the visiting ladies will be amply provided for. Engineers, superintendents, commissioners, registrars, and all officers connected with the waterworks systems of the country should make an effort to be present on the occasion, not only on account of the valuable information on waterworks subjects that will be presented, but also to partake of the enjoyable outing provided for them in the Empire city of the Empire State. PETER MILNE, C. E., Secretary.