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SYMBOLS

See Elements, Chemical Interactions, and Formulae.

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SINAPiNE

An organic base of alkaloidal character contained in white mustard seed.

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SUPERBASIQUE METAL

A modification of cast iron, having a greater resistance to the action of alkaline solutions.

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SOXHLET APPARATUS

is of glass and used for the extraction uf soluble parts uf substances by the action of volatile solvents, such as fat from milk.

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SILAGE

A fermentation product used as cattle food, made from green fodder, which is cut up and stored in such wise that acetic acid is produced and acts as a preservative..

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SACCHARATE, STRONTIUM

A sparingly soluble body prepared from the motherliquor of molasses by combination of the remaining crystalli/.able sugar therein with strontium oxide it ran be decomposed by suspension in water and treatment with carbon dioxide.

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SPONTANEOUS COMBUSTION

ensues as a result of the develop ment of heat arising from chemical changes; thus, cotton waste soaked in linseed oil will sometimes fire in consequence of the rapid oxidation of the oil. Similarly phosphorus exposed to the air will take fire, and burnt lime during slaking with water develops enough heat to fire wood that may happen to be in contiguity.

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SPECIFIC GRAVITY FLASK

This is used for determinmg the specific gravity of fluids by weight, and in practice it is ujiual to employ a stoppered flask filled at i55 degrees C., the stopper being inserted so that the liquid overflows and no air is left in the flask. Its weight as compared with that of water determines the specific gravity The weight of the liquid having been ascertained, and that of the same quantity of water at the same temperature being known, the specific gravity of the liquid is ascertained by dividing it by the latter.

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SORGHO

A sugarproducing grass resembling maize in appearance.

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SALT CAKE

The crude sodium sulphate as manu factured by the old Leblanc sodaprocess.

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