[86] It may be from this Principle, that in the East, Liquids are kept _cool_ by being hung in the Shade, in the _open_ Air, suspended in _wet Cloths_: there being a continual Breeze and Succession of +cool dry+ _Spunges_ (as it were) of Air, in Contact with the _wetted_ Cloths, whose Moisture will thus be more quickly evaporated. [87] Historia Ventorum, Pag. 48, Art. 33. [88] “Cum enim (Venti) Choreas ducant, Ordinem Saltationis nosse jucundum fuerit. Art. 18.” [89] On the Action of the Sun and Moon over Animal Bodies, by Dr. Mead, Miscell. Cur. Vol. 1. P. 372, 373. [90] For these Observations see Gassendus’s Natural Philosophy. De Chales’s Navigator. And Astro-Meteoro-Logica, per J. Goad. [91] See Maclaurin’s Newton, Page 376. [92] Air at a Medium is 800 Times _rarer_ than Water: so that if 800 Times the Quantity of Air _naturally_ contained in a Vessel whose Dimensions are those of a cubic Foot, were pressed into it by a Syringe or _Condenser_, the Air woud differ nothing from Water in Density. [93] See Wilson on Climate, Chap. 15. Pages 46, 54. [94] 55. [95] By reducing 10 Feet 6 Inches, and 6 Feet 7 Inches, into Inches, and dividing by common Divisors, as 3 and 2; it is found that 10 Feet 6 Inches, will be to 6 Feet 7 Inches, as 3 to 2 nearly: that is, as 15 Miles to 10 Miles. [96] White’s Ephèmeris, Page 38, for the Speculum Phenomenorum, or Mirror of the Heavens. [97] See the Book which gives an Account of Walker’s Eidouranion. The _intelligent_ Reader will easily distinguish the Effects, attributed to the Planets, viz. their mutual Attractions, owing to natural Causes only;—from the futile Ravings of judicial Astrology. [98] See London Chronicle, 26th July, 1785. [99] To find the Direction of an upper Current, without the Inconvenience of rising above the Level which the Aironaut has fixed on. This the Abbé Bertholon has hinted at, by Means of a smaller Balloon. The Dimensions of which, must however be so large; that, allowing for the Evaporation of Gass, it will _just_ rise with the Weight of a Quantity of Cord, a Mile and half, for Instance, in Length: and have sufficient Room left within, to admit of the Expansion of Gass without Rupture. The Pioneer-Balloon may be taken up, _empty_, and filled with Gass necessarily escaping from +the mouth+ of the _great Balloon_, when stationary: and may be sent up with a Cord, fastened to the Center above the Car of the _great Balloon_, to reconnoitre the _superior_ Currents: or it may be only filled _in Part_; and made to _descend_, and _discover_ the _lower_ Currents. See “Des Avantages de Ballons, &c. Page 72.” [100] As the _Heights_ of the Atmosphere encrease in an _arithmetical_ Progression; the Densities are said to encrease in a _geometrical_ Progression: which is a mathematical and pedantic Mode of Expression. For _arithmetical_ Progression _here_ means no more than the Height of 1, 2, 3, 4, 5, 6, &c. &c. Yards, Fathoms, Roods, or any other equal Interval.