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A Treatise, Shewing The Intimate Connection That Subsists Between Agriculture And Chemistry : Addressed To The Cultivators Of The Soil, To The Proprietors Of Fens And Mosses, In Great Britain And Ireland; And To The Proprietors Of West India Estates / By The Earl Of Dundonald
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AGRICULTURE WITH CHEMISTRY. ¥S5

EARTH OF IRON

Exists in ground in a metallic state, in the state of

an earth, and in the state of a mineral salt. It is the only metallic earth thought necessary to define, in this Trea- tise on Agriculture. An attempt will hereafter be made

to explain the manner in which it promotes vegetation.

AIR.

By air is generally understood, the medium in whicl

terrestrial animals move and breathe. It is possessed of weight or gravity, is capable of compression: without it neither animals could live, nor could fire be main-

tained, or heat generated.

Part only of atmospheric air serves for the support of

animal life and combustion, called vital air, pure air, or

oxygen.

 
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