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n; distinction. The speculative line of demarcation, where obedience ought to end and resistance must begin, is faint, obscure, and not easily definable. Burke.

A substance, usually of a mucilaginous or oily nature, supposed to be capable of soothing an inflamed nervous membrane, or protecting i

An instrument for ascertaining the specific gravity or density of a substance.

ter, to bulk or volume, esp. as compared with the mass and volume of a portion of some substance used as a standard.

A powder or other substance to be used in cleaning the teeth; tooth powder.

The dense calcified substance of which teeth are largely composed. It contains less animal matter than bone, and in the teeth of man is situated beneath the enamel.

Division; separation, as of compound substances into their ingredients. [Obs.] The chymists have a liquor called water of depart. Bacon.

The distance due east or west which a person or ship passes over in going along an oblique line.

call such complex ideas which . . . are considered as dependencies on or affections of substances. Locke.

That which depends; corollary; consequence. With all its circumstances and dependents. Prynne.

A substance used to deplete.

A substance used to prevent polarization, as upon the negative plate of a voltaic battery.

o subject to plunder and pillage; to despoil; to lay waste; to prey upon. It makes the substance of the body . . . less apt to be consumed and depredated by the spirits. Bacon.

The angular distance of a celestial object below the horizon.

A substance so related to another substance by modification or partial substitution as to be regarded as derived from it; thus, the amido compounds are derivatives of ammonia, and the hydrocarbons are derivatives of methane, benzene, etc.

To obtain one substance from another by actual or theoretical substitution; as, to derive an organic acid from its corresponding hydrocarbon.

A genus of coleopterous insects, the larvæ of which feed animal substances. They are very destructive to dries meats, skins, woolens, and furs. The most common species is D. lardarius, known as the bacon beetle.

, Discovery or view, as of an army seen at a distance. [Obs.] Near, and on speedy foot; the main descry Stands on the hourly thought. Shak.

rcæ, or Fates; the supposed powers which preside over human life, and determine its circumstances and duration. Marked by the Destinies to be avoided. Shak.

A bar, connected with a switch, longer than the distance between any two consecutive wheels of a train (45 to 50 feet), laid inside a rail and operated by the wheels so that the switch cannot be thrown until all the train is past the switch.