EXPLANATION OF CHEMICAL TERMS.

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OXACIDS. Acids consisting of an element united with oxygen. OXIDE. A combination of oxygen with a body.

OXIDATION.

The act of forming an oxide.

P.

PESTLE. An instrument to beat in a mortar.

PHOSPHOREScence.

The act of glowing like phosphorus or

putrid fish in the dark.

PNEUMATIC (TVevμa, a spirit.) Of or belonging to gases.
PULVERIZE. To reduce to powder.

PYROMETER. A measurer of high temperatures.

POLYMORPHOUS. Having several crystalline forms.

POLYMERIC BODIES. When the formula of one body is a multiple of another by 1, 2, or 3, &c., they are polymeric.

R.

RADICAL. A base or root of compounds.

REAUMUR'S THERMOMETER. -Boiling point, 80°; freezing point, 0°. To reduce Reaumur to Fahrenheit, multiply by 2.25 (21), and add 32. Thus 40° R. x 2.25 = 90+32= 122° F.

To reduce Fahrenheit to Reaumur, subtract 32 and divide the remainder by 2.25.

RECEIVER. A vessel for receiving distilled fluids.

RECTIFICATION. Frequent distillation.

REFRIGERATION. The act of cooling.

REFLECTION. The bending back of a ray of light or heat.

RESIDUE. The remainder.

RETORT. A vessel for distilling, fig. 15.

S.

SAFETY TUBE.

tillation.

A tube for the admission of common air in dis

SATURATION. As much as a body can take up.

SOLUTION. The act of dissolving.

SOLVENT. A body which dissolves another.

SPATULA. A flat instrument of platinum, or porcelain, &c., for stirring.

SPECIFIC GRAVITY. Peculiar weight, p. 7.

STILL. A metallic vessel for distillation.

STOPCOCK. A valve to close and open a vessel.

SUBLIMATION. To raise up a solid by heat.

SUCKER. A tube for sucking up fluids, fig. 29.

SYPHON. A bent tube for conveying fluids from one vessel to

another, fig. 86.

SYNTHESIS (συνθεσις).

Formation of a body from its elements.

T.

TEMPERATURE. The state of heat.

TESTING.

THEORY.

The application of tests, or reagents.

From Sewpia. Mode of seeing; explanation.

THERMOMETER, A measurer of heat.

TRITURATE. To rub together.

TROUGH. A vessel for holding water or mercury in examining gases.

V.

VALVE. A lid or door opening in one direction in a tube.
VAPOUR. The gaseous or elastic form of a fluid.

VENTILATION. The removal of noxious gases from the atmosphere, and introduction of pure air.

VOLTAIC BATTERY. An arrangement of a series of two metals for producing electricity.

WRIGHING. The act of determining the weight of a body.

WORM TUBE.

A tube bent like a worm, for condensing distilled

fluids. WOULFE'S BOTTLES.

gases in water, &c.

Vessels with three openings for condensing

APPENDIX.

Nitric Acid.

TABLES OF THE STRENGTH OF ACIDS, &c.

Amount of dry Acid in 100 Parts.