The hymns of the RV. are without exception metrical. They contain on the average ten stanzas, generally of four verses or lines, but also of three and sometimes five. The line, which is called Pada, ('quarter') and forms the metrical unit, usually consists of eight, eleven, or twelve syllables. A stanza is, as a rule, made up of lines of the same type; but some of the rarer kinds of stanza are formed by combining lines of different length. There are about fifteen metres, but only about seven of these are at all common. By far the most common are the Tristubh (4 x 11 syllables), the Gayatri (3 x 8), and the Jagati (4 x 12), which together furnish two-thirds of the total number of stanzas in the RV. The Vedic metres, which are the foundation of the Classical Sanskrit metres except two, have a, quantitative rhythm in which short and long syllables alternate and, which is of a generally iambic type. It is only the rhythm of the last four or five syllables (called the cadence) of the line that is rigidly determined, and the lines of eleven and twelve syllables have a caesura as well. In their structure the Vedic metres thus come half way between the metres of the Indo-Iranian period, in which, as the Avesta shows, the principle is the number of syllables only, and) those of Classical Sanskrit, in which (except the sloka) the quantity of every single syllable in the line is fixed. Usually a hymn of the Rigveda consists of stanzas in the same metre throughout; a typical divergence from this rule is to mark the conclusion of a hymn with a stanza in a different metre. Some hymns are strophic in their construction. The strophes in them consist either of three stanzas (called trca) in the same simple metre, generally Gayatri, or of two stanzas in different mixed metres. The latter type of strophe is called Pragatha and is found chiefly in the eighth book.
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