D. Coggeshall. No 421 Pearl-street in this city, and found the water evidently affected by the lead. He has also obtained similar results in several other instances. If the precaution be used,

of not employing the water first drawn from the pipes for dietetic and culinary purposes, no injurious consequences would probably attend the use of water conveyed

in this metal, but as this is not likely to be attended to generally, it is expedient

to employ other measures to guard against its deleterious effects.

For this pnrpose, various means have been suggested, such as the substitution

of block -tin and other metals not acted upon by water; but the most efficient, scientific, and useful, as well as the most economical, of all the plans hitherto proposed, is that introduced by Thomas Ewbank, Esq., of coating the lead-pipes with tin

both inside and out. The process, which has been patented, consists simply in drawing an ordinary lead-pipe through a bath of melted tin, coated with a layer of melted rosin, which leaves a continuous deposit of tin upon both sides of the pipe, of sufficient thickness, to effectually prevent any oxidation of the lead. These

* Containing 4.05 grains of solid matter to the gallon, or about one 18,000 part.

pipes have been highly recommended by our first chemists, and other men of science, as furnishing an effectual safeguard against the corroding effects of pure water

This highly ingenious process, strengthens the pipe, without diminishing its elasticity, and although some small portions of the lead should escape being coated, yet the proximity of the tin, will, from galvanic action, probably prevent oxidization of