An abstract from Philosophical Transactions of a letter by Giovanni Ciampini of Rome describing asbestus (amiantus) and how to spin and weave it into incombustible cloth. It describes four varieties of the stone in his museum, his tests of it as a lamp wick and in fire, and the washing, carding and oiling steps used to prepare the fibers. He found that mixing asbestus filaments with flax on a distaff gave stronger thread than twisting them with plain thread on a reel. The article ends with advice on keeping asbestus cloth oiled and cleaning it by burning. It includes an engraved plate of the carding, reeling and oiling implements.