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7^2 Uses of

Sickrtess in Ships is the noxious putrid Air ;the obvious Remedy is, the exchanging thatfoul Air for fresh, by effectual Means, whichare seldom discovered by dwelling only onObjections; but are usually the Reward ofrepeated, diligent, experimental Researches.Neither are we to be discouraged in theseour Pursuits by some Disappointments, forI have frequently found that they lead to theThing sought for.

353. And by the like Clue of Reasoningand Experimenting, there is the greatest Pro-bability that we shall succeed in another veryimportant Research, viz. the preserving muchlonger from Decay the Timbers of Shipslaid up in ordinary in Harbour : For as weare assured by daily Experience, that the De-cay is wholly owing to damp, close, con-fined, putrid, corroding Vapour and Air j sothe only Remedy for this Evil, is the fre-quently changing the Air and Vapour amongthe Timbers, by plentiful Ventilations; whichwe find, by happy Experience, can be effectedto such a degree, as gives reasonable Hopes*enough to encourage our further Trials andResearches,

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