7.—Measuring, Weighing, and Testing.

A two-foot rule.

Measurements of length—first by eye, then with rule. Measurements in inches only.

Easy measurements of a square—first by eye, then with rule. Measurements in inches only.

Easy measurements of rectangles.

The wire-guage.

Callipers.

Scales and weights.

Weighing of common objects—first by hand, then with scales. Weight in ounces only.

Weighing letters. Plumb-line.

Spirit-level.

Steam—observations on boiling water; condensation of steam, &c.

Mercury—weight of; of. drop of mercury and drop of water; effect of heat on mercury.

Alcohol—effect of heat on it; its evaporation.

Thermometer, its manufacture.

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Thermometer—uses; readings in ice, In boiling water, under the tongue, in schoolroom.

A candle—its composition. The wick.

Candle under bell-jar over water; candle in narrow-necked bottle.

Chalk—where found; its origin.

Chalk—its treatment with acid.

Chalk—its reduction to quicklime with blow-pipe; lime-water.

Sugar heated in test-tube; wood heated in test-tube.

Sulphur heated in test-tube; lead heated in test-tube.

Magnet and iron filings.

The compass.