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tnymTcal Operations, that were able tcdissolve it ; which is a plain Indication tome, that if the Powder of this Fossil onlywas mixed with the Pitch instead of theother Ingredients above-mentioned,.it wouldhe a perfect safe-guard to,the Ships, so asto . sedufe-them against thpse .pernicious Ani-mals the Wormswhich not only endangeriheCargo and lives of Men, but are also noinconsiderable Loss to the Owners ofShips.

- Having-thus settled the Theory of theMatter, I proceeded to the experimental•Part, being strongly sollicited and encou-raged thereto by arideirunent .Surgeon thatdived in a Sea-port Town in this Kingdom .;at his earnest Request I mixed , up a few'Pounds of Pitch with. .powdered ‘Tale ;which , he accordingly , spread on a Piece ofTimber, in like manner as is done on theShips Bottoms, with their other Preparati-ons; and more estectuallyto try the resistivePower of this Ingredient when only usedwith the Pitch , he took the same Quan-tity as to Weight of the common Prepa-ration of Pitch with Brick-dust, and theother Compositions as before-nientioned,•and spread that also upon another Piece ofTimber, in like manner as the first ; boththese Pieces of Wood were put into theSea together, secured so as to prevent theirfloating away; when, taking them up at