Q. Again I will trouble you in regard to a question. I am about to fit a water-closet up in a bath-room, and I want to run the 4-inch pipe to the roof and put a cap on it, but the owner wants it run into the chimney, which is alongside of the closet. I tell him it will not be as good a job as if taken through the roof, but he differs with me. Now, from what I have read, the chimney-flues are condemned in general. Please tell me who is right.

P. S. - The container will be ventilated.

A. We repeat an opinion often given. The soil-pipe should be taken through the roof, not run into the chimney-flue. You cannot depend on having an up-draught in the flue all the time. It is difficult to make a joint where you run a soil-pipe into the chimney which will keep tight, and the soot is liable to choke up the end of your ventilating-pipe.