ADDITIONAL NOTES. 485

welt winds» 3. Devaporation from mechanical expanſion of air, as in the receiver of an air-pump z; ſummer clouds appear and vaniſfh; when the barometer ſinks without change of wind the weather becomes colder. 4. Solu- tion of water in ele&ric fluid dubious. 5. Barometer ſinks from the leffened gravity of the air, and from the rain having leſs preſſure as it falls; a mixture of a ſolu- tion of water in calorique with an aerial ſolution of water is lighter than dry air; breath of animals in cold weather why condenſed into viſible vapour and difiolved again.

NoTE XXV1.--SPRING3.

LowesT ſtata of the earth appear on the higheſt hills; ſprings from dews ſliding between them; mountains are colder than plains; 1. from their being inſülated in the air; 2. from their enlarged ſurface; 3. from the rarety of the air it becomes a better conduttor of heat; 4. by the air on mountains being mechanically rarefied as it aſcends; 5. gravitation of the matter of heat; 6. the daſhing of clouds againſt hills; offogs againſt trees; ſprings ſtronger in hot days with cold nights; ſtreams from ſüubterrancan caverns; from beneath the ſnaw on the Alps.

NoTz XXVIL--SaptL-Fisn.

Tur armour of the Echinus moveable; holds itſelf in ſtorms to(tones by 1206 or 2000 ſtrings; Nautilus rows and ſails; renders its ſhell buoyant: Pinna and Cancer; Byſtus of the antients was the beard of the Pinna; as fine as the ſilk is ſpun by the ſilk-worm; gloves made of it; the beard of muſcles produces ſickneſs; Indian weed; tendons of rats tails.

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