I have heretofore given my only experience in removing coal tar from hot-water pipes without burning them. I will re-state that the pipes in question were painted with tar from the gas works here. A wash made with six pounds of potash to about ten gallons of water was applied with a swab boiling hot. The stuff left the pipes in inky blackness, and by going over them two or three times were left as clean as when first cast; and there has never been a trace of tar in the house in all these years since. The pipes are ordinary 4 inch cast iron, in lengths about 5 feet, called soil pipe; made by J. L. Mott, N. Y.

Ogdensburg, N. Y.