Subscriber, Y psilanti, Mich , writes:

"In the city of Y psilanti, Mich., in which they are putting in water-works, the Superintendent of the Water Board claims that a ½-inch connection of common black iron pipe run from a city main - the distance of about 50 feet, and the pressure on the city main is 70 pounds to the square inch - would be sufficient to supply a house containing one bathtub, four washstands, one water-closet, one sink, and one ¾-inch street-washer. Bathtub, washstands, and sink are supplied with hot and cold water.

"The plumber wanted a 1-inch connection, but the Board of Water Commissioners laughed at him. As it was, he put in a 1-inch connection from service cock. Please state in your paper what you think about it."

[Under the conditions of pressure stated, a ½ - inch round-way corporation cock would probably answer the purpose, but the service pipe should not be less than three-fourths inch, and a 1-inch service pipe is not a needless extravagance, as the additional expense is small, and the loss of head by friction is much less in a pipe of any length.]