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ensation of two or more molecules of silicic acid. Polysilicic acid (Chem.), any one of a series of acids formed by the condensation of two or more molecules of silicic acid, with elimination of water.

A station, or one of a series of stations, established for the refreshment and accommodation of travelers on some recognized route; as, a stage or railway post.

a discourse, or written as introductory to a book or essay; a proem; an introduction, or series of preliminary remarks. This superficial tale Is but a preface of her worthy praise. Shak. Heaven's high behest no preface needs. Milton.

To go on in an orderly or regulated manner; to begin and carry on a series of acts or measures; to act by method; to prosecute a design. He that proceeds upon other principles in his inquiry. Locke.

A series of actions, motions, or occurrences; progressive act or transaction; continuous operation; normal or actual course or procedure; regular proceeding; as, the process of vegetation or decomposition; a chemical process; processes of nature. Tell her the process of Antonio's end. Shak.

The series of cells formed in the ovule of a flowering plant after fertilization, but before the formation of the embryo.

A heavy gaseous hydrocarbon, C3H8, of the paraffin series, occurring naturally dissolved in crude petroleum, and also made artificially; -- called also propyl hydride.

designating, an organic acid (called also propargylic acid) of the acetylene or tetrolic series, analogous to propionic acid, and obtained as a white crystalline substance.C3H2O2, CH.C.COOH

r. Propionic acid is so called because it is the first or lowest member of the fatty acid series whose salts have a fatty feel.

A colorless gaseous hydrocarbon (C3H6) of the ethylene series, having a garlic odor. It occurs in coal gas, and is produced artificially in various ways. Called also propene.

Denoting the first or lowest of a series, or the one having the smallest amount of the element to the name of which it is prefixed; as protoxide, protochloride, etc.

That one of a series of sulphides of any element which has the lowest proportion of sulphur; a sulphide with but one atom of sulphur in the molecule.

That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b). protoxide of nitrogen, laughing gas, now called hyponitrous oxideNO. See under Laughing.

A hydrocarbon of the aromatic series, metameric with mesitylene and cumene, found in coal tar, and obtained as a colorless liquid.

A single beat or throb of a series.

Dr. Pusey and others at Oxford, England, as exhibited in various publications, esp. in a series which appeared from 1833 to 1841, designated " Tracts for the Times;" tractarianism. See Tractarianism.

Same as Tetragonal. Pyramidal numbers (Math.), certain series of figurate numbers expressing the number of balls or points that may be arranged in the form of pyramids. Thus 1, 4, 10, 20, 35, etc., are trangular pyramidal numbers; and 1, 5, 14, 30, 55, etc., are square pyramidal numbers.

A white crystalline substance, C6H4(OH)2, of the phenol series, found in various plants; -- so called because first obtained by distillation of gum catechu. Called also catechol, oxyphenol. etc.

Pertaining to, or designating, an acid of the acrylic acid series, metameric with crotonic acid, and obtained as a colorless liquid; -- so called from having four carbon atoms in the molecule. Called also isocrotonic acid.

A series of quarters, or small upright posts. See Quarter, n., 1 (m) (Arch.) Gwilt. Quartering block, a block on which the body of a condemned criminal was quartered. Macaulay.