ioB Of Pneufnatics.

The ivonfoons. To thele and such like caufes'is owing, i. The irregularity and un-certainty of winds in climates distant from the equator, as in most partsof Europe. 2. Those periodica] winds, called monfoons , which in theIndi an feas blow half a year one way, and the other half another.3. Those winds which on the coast of Guiney, and on the Westerncoasts of America, blow always from west to east. 4. The fea-breezes,which, in hot countries, blow generaliy front fea to land, in the day-time ; and the land-breezes, which blow in the night; and, in ffiort,all those storms, hurricanes, whirlwinds, and irregularities, which hap-pen at disterent times and places. ; ;

The vivifying AU common air is impregnated withti certain kind of vivifyingspirisjfiritin air. Q r quality, which is necestäry to continue the lives of animals: and thisi,in a gallon of air, is sufficient for one man during the fpace of a mi-nute, and not much langer.

This fpirit in air is destroyed by paffing through the lungs of ani-mals : and hence it is, that an animal dies foon, aster being put undera vestel which admits no freffi air to come to it. This'fpirit is also inthe air which is in wäter ; for fiffi die when they are excluded frontfreffi air, äs in a pond that is- clofely’ frozen over. ’ And the little eggsof infects, stopped up in a glafs, do not produce their young, thougliaffisted by a kindly warmth. The feeds also of plants mixed withgood earth, and inclofed jn a glafs, will not grow./sm .11 ■

This enlivening quality in air, is also destrpyed by the air’s paffingthrough fire; particularly charcoal fire, or the flante of sulphur. Hence,smoking chimneystmust be very unwholefome, efpecially if the roomsthey are in be finali and dose. '

Air is, also vitiated, by remaining clofely pent up in any place fora considerahle fime or perhaps, by being mixed with malignant-steams and particles flöwing from the’ neighbouring bodiesor lastly,by the corruption of the viyifyijng fpirit as in the holds of ffijps, inoil-cisterns, or wine-cellars, which have been ffiut up for a consi-derable time. The air in any of them is fometimes fo much vitiated,as to be immediate, death to any animal that comes into it.

Damps. Air that has lost its vivifying fpirit,, is called dampj not only becauseit is filled with humid or moist Vapou% Ibut. because it deadens fire,extinguiffies flame, and, destroys life, ,1 The dreadful estects of dampsare fufliciently known to such as work in mines.

If part of the vivifying fpirit of air ta any country begins to putrify,-the inhabitants of- that country will be fubject to an epidemica! -discafe,vyhich will continue until the putrefaction-is pver. And as the puntrefying fpirit occafxons the difeafe, fo if the difeafcd body contributes»

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