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(310x.)

III. THATCHED HOUSES,

PUDDLE MORTAR WALLS,-DRY WALLS, POINTED,-mud walls of a GOOD

KIND.

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OF DWELLING HOUSES, OR CELLARS, USED AS DWELLINGS.

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Where houses are built of wood, as in America, we deduct 10 per cent. from the value of a brick house of the same size and location, where the winters are cold. In the Southern States, where the winters are warm, we deduct 20 per cent. from the value of a brick house similarly situated. We value a first-class frame or wooden house as if it was built of brick, and then make the above deductions, or that which local modifying circumstances will point out, such as climate, scarcity of timber, brick, lime, etc.

OFFICES.

The rate per square for offices of the I., II., III. and IV. Classes, is half that supplied in the foregoing Tables; Offices of the V. Class have the rate per square as follows:

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TABLES for ascertaining, by inspection, the relative value of any portion of a Building (nine square feet, or one yard,) and of any height, from I to V stories.

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SIGNIFICATION OF THE LETTERS.

Built or ornamented with cut stone, of superior solidity and finish.

Very substantial building and finish, without cut stone

ornament.

A- Ordinary building and finish, or either of the abeve, when built 25 or 30 years.

B+ Medium, in sound order, and in good repair.

2ND

B

CLASS.

3RD CLASS.

C

Medium, slightly decayed, but in repair.

B- Medium, deteriorated by age, and not in good repair.
C+ Old, but in repair.

Old, and out of repair.

C— Old, and dilapidated-scarcely habitable.

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GEOLOGICAL FORMATION OF THE EARTH.

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810B. Roc originally horizontal, are now, by subsequent changes, inclined to the horizon: some, are found contorted and vertical; often inclined both ways from a summit, aud forming basins, which God has ordained be great reservoirs for water, coal and oil, from which man draws werby artesian wells, to fertilise the sandy soil of Algiers, and to supply bim win fuel and light, on the almost woodless prairies of Illinois. Unstratifed works, are those which do not lie in beds, as granite. Stratified ks. Le in bed, as limestones, etc.

Dykes, re where fissures in the rocks are filled with igneous rocks, such as lava, trap rocks. Dytes seldom have branches; they cross one ano.be", and are sometimes several yards wide, and extend from sixty to seventy miles in England and Ireland.

Veins. feeders or lodes, ale fissures in the rocks, and are of various thicknesses; are parallel to one another in alternate bands, or, cross one another as net work.

Metallic veins, ae principally found in the primary rocks in parallel bands, and seldom isolated, as several veins or lodes are in the same locality. Those lodes or veius which intersect others, contain a different mineral.

Gangue or marr, is the stony mineral which separates the metal from the adjo ug rock,

Metallic indications, are the gangue and numerous cavities in the ground, or holes on the su fice, co responding to those formed underneath by the action of the water.

The crust of the earth, is supposed to be four and one-fourth miles, and arranged as follows by Regault and others:

Format'n Gup.

Transition Rocks. Secondary Formation. Tertiary Formation. Recent.

I.

Formation.

Vegetable scil.

Aliud deposits filling estuaries.

II. Upper Te: ia- Modern voleanoes, both extinct and burning.
ry or Pheme S a of unei ut sand, alheimi.

III.

IV.

and Mene. Bonfaes, drift, tula, contaimug fos il bones.

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V.

Upper

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JX.
X.

Sandstone.
Permau.

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Tre hwater Tonetones, buri stones, sometimes contain-
ing ligures.
Sandstone of Fontainbleau.

Marls with gypsum, fossils of the mammiferæ.
Cosse bme-tone.

Plastic clay with lignite.

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Conglomerate and sandstone.

Limestone mixed with slate.

Limestone conglomerate and sandstone, termed the new red sandstone.

XI. Carboniferous Sandstone, slates with seams of coal and carbonate of iron, (clay iron stone.)

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