alone.”—­Inst., p. 16; Hazen, Lennie, and Brace, cor. (14-18.) “Spelling is the art of expressing words by their proper letters.”—­G.  BROWN:  Lowth and Churchill cor.; also Murray, Ing. et al.; also Comly; also Bullions; also Kirkham and Sanborn. (19.) “A syllable is one or more letters, pronounced by a single impulse of the voice, and constituting a word, or part of a word.”—­Lowth, Mur., et al., cor. (20.) “A syllable is a letter or a combination of letters, uttered in one complete sound.”—­Brit.  Gram. and Buch. cor. (21.) “A syllable is one or more letters representing a distinct sound, or what is uttered by a single impulse of the voice.”—­Kirkham cor. (22.) “A syllable is so much of a word as is sounded at once, whether it be the whole or a part.”—­Bullions cor. (23.) “A syllable is so many letters as are sounded at once; and is either a word, or a part of a word.”—­Picket cor. (24.) “A diphthong is a union of two vowels in one syllable, as in bear and beat.”—­Bucke cor. Or:  “A diphthong is the meeting of two vowels in one syllable.”—­Brit.  Gram., p. 15; Buchanan’s, 3. (25.) “A diphthong consists of two vowels put together in one syllable; as ea in beat, oi in voice.”—­Guy cor. (26.) “A triphthong consists of three vowels put together in one syllable; as, eau in beauty.”—­Id. (27.) “But a triphthong is the union of three vowels in one syllable.”—­Bucke cor. Or:  “A triphthong is the meeting of three vowels in one syllable.”—­British Gram., p. 21; Buchanan’s, 3. (28.) “What is a noun?  A noun is the name of something; as, a man, a boy.”—­Brit.  Gram. and Buchanan cor. (29.) “An adjective is a word added to a noun or pronoun, to describe the object named or referred to.”—­Maunder cor. (30.) “An adjective is a word added to a noun or pronoun, to describe or define the object mentioned.”—­R.  C. Smith cor. (31.) “An adjective is a word which, without assertion or time, serves to describe or define something; as, a good man, every boy.”—­Wilcox cor. (32.) “An adjective is a word added to a noun or pronoun, and generally expresses a quality.”—­Mur. and Lowth cor. (33.) “An adjective expresses the quality, not of the noun or pronoun to which it is applied, but of the person or thing spoken of; and it may generally be known by the sense which it thus makes in connexion with its noun; as, ’A good man,’ ‘A genteel woman.’”—­Wright cor. (34.) “An adverb is a word used to modify the sense of a verb, a participle, an adjective, or an other adverb.”—­Wilcox