A SLAG, remaining in the bottom of the Tin-Floate. Sent by Mr. Colepress. Of a bright colour next to Silver. Yet contains (saith he, mostly) Iron; which he accidentally perceiv'd, by applying the Magnet to it, both quickly uniting. But note, that now, at least, they will not, unless you take small Sparks only, and these will leap up to it. He also saith, That one Dr. Stall a German Chymist, affirmed, the Dutchmen make good spelter of it.