We do not insist here, that there is no Difference between the Land and Sea Scurvy, or that there are no other Reasons for the Sea Scurvy than are here mentioned. We know that some other Causes are assigned, as the being so long absent from Land, and thereby receiving none of those Vapours, which, coming out of the Earth, may be necessary for the Preservation of a Land Animal, &c. and these Causes likewise may correspond with the former, here mentioned. We shall now beg Leave to offer a little Scheme, for hindering the Progress of the Sea Scurvy, which however we do not insist upon, having no great Opinion of any Proposition, which we start new of our own. What I would propose is, some Help or Relief to a Ship, when she is on a long Voyage, and sailing before a Trade Wind, and finds the Scurvy begin to attack her. In order to which, it will be necessary to say something concerning the Nature of that Element called the Air. Air is an elastic Fluid, as has been observed before, and is subject to an easy Motion of it's Parts amongst themselves, as all Fluids are. It is subject to Currents and Eddies, in the same Manner as Water. A Current of Air is commonly known by the Name of Wind; and the greater Quantity of this Air or Wind, an Animal who has Organs for the Reception of it, and who cannot live without it a Moment; the more free Passage (I say) a Current of Air has, by such an Animal, in Health and Motion, the more wholesome it is for him. Now, I will endeavour to prove, that a Ship under Sail, before a Trade Wind, has but little Change of Situation in this Current, notwithstanding her Motion is so swift, with regard to her Change of Place upon the Surface of the Earth. We will endeavour to explain our Meaning, by a Cork swimming down a current of Water. If any one throws a Cork into a Stream of Water, he will find that the Cork will be attended, during its Progress down the Stream, by the same Particles of the Fluid, which it happened to fall upon, when it first set off; notwithstanding, it changes its Position, with regard to the Surface of the Earth. This is the Case with a Ship, sailing before the Wind; she receives nothing near the Quantity of Air, upon her Sides and between her Decks, in a full Wind, that she does when the Wind is upon her Beam, or on one Side of her; which may be demonstrated by a second Experiment upon the Cork in the Water.