170 *I‘he Uses of

by keeping a Horse or two constantly on-board, to work the Ventilators in calm Wea-ther ; the Expence of this would be incon-siderable, in comparison of the great Benefitin preserving such very expensive Fabricks.

454. And as it is found by Experience inmany Ships, that the Hold and Insidcs ofShips are much cooler and sweeter by Venti-lation, so it is reasonable to conclude, that theVentilating of Ships at Sea by the Labour ofMen, will not only be a Means of preservingthe Health and Lives of many, and also ofthe better preserving Provisions; but will bealso of considerable Benefit in preserving theShip itself something the longer from Decay;and this as surely as it is certain that Shipswill decay faster with a hot, close, confined,putrid Air, than with a cool, fresh Air. Thusthe Timbers of our Eaji-India Ships are foundto be very subject to Decay, by reason of thehot, foul, putrid Air in the Hold. Hence itis also, that Store-sails. Ropes, and even Ca-bles, are damaged thereby.

455. The Reverend Dr. Tucker , of Bristol,informs me, that the Ships which bring Yarnso short a Voyage as from Ireland to Bristol.,

are