T4 A TREATISE ON THE CONNECTION OF

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SILACEOUS.MAg TER.

GREAT tracts of the surface of the earth are of this description, and very large masses of the under stratum consist of the like substance: the former in the state of loose sand, and the latter in an indurated or solid state, called sand-stone or free-stone. It is, of all the earths,

the least retentive of moisture.

MAGNESIAN EARTH.

Tuis is no where found in such quantities.as to form a

many soils, and constitutes a component part of stea-

| | . aA~°° pees a: ya eusies:‘ i} soil of itself; it 1s contained in different proportions, in j tities, or soap rock. It is retentive of moisture to a cer-|

tain degree.|

EARTH