[15] While this is not the place to treat in detail with Spanish versification, it may be well to define briefly the forms used in the play which are not met with in English. The redondilla is composed of four verses of seven or eight syllables each, the first verse riming with the fourth and the second with the third. The romance is composed of any number of seven or eight syllable verses, in the even numbers of which there is a correspondence of vowel sounds in the last two syllables, which is called assonance. The décima consists of ten octosyllabic verses, of which generally the first rimes with the fourth and fifth, the second with the third, the sixth with the seventh and tenth, and the eighth with the ninth. The octava has eight hendecasyllabic verses of which the first rimes with the third and fifth, the second with the fourth and sixth, and the seventh with the eighth.