OK COMPOUND BODIES,

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sition and nature of each individual acid is in somedegree pointed out, instead of the class of bodiesfrom whiob it is extracted; and, with regard to themore general division of acids, they are classedunder these four heads:

First, Acids of known and simple bases, which areformed by the union of these bases with oxygen.They are the following :

The Sulphuric

Carbonic

Nitric

Phosphoric

Arsenical

Tungs/enic

Molybdcnic

Acids of known and sira«pie bases.

2dly, Those of unknown basis:

The Muriatic j

Boracic > Acids of unknown bases.

Fluoric '

These two classes comprehend the most ancientlyknown, and most important acids. The sulphuric,nitric, and muriatic, were formerly, and are stillfrequently, called mineral acids.

3dly, Acids that have double or binary radicalsand which consequently consist of triple combina-tions. These are the vegetable acids, whose com-mon radical is a compound of hydrogen and car-bone.