The ritual chant has its special laws of execution which involve long study on the part of one who wishes to master it. Large attention is given in the best seminaries to the purest manner of delivering the chant, and countless treatises have been written upon the subject. The first desideratum is an accurate pronunciation of the Latin, and a facile and distinct articulation. The notes have no fixed and measurable value, and are not intended to give the duration of the tones, but only to guide the modulation of the voice. The length of each tone is determined only by the proper length of the syllable. In this principle lies the very essence of Gregorian chant, and it is the point at which it stands in exact contradiction to the theory of modern measured music. The divisions of the chant are given solely by the text. The rhythm, therefore, is that of speech, of the prose text to which the chant tones are set. The rhythm is a natural rhythm, a succession of syllables combined into expressive groups by means of accent, varied pitch, and prolongations of tone. The fundamental rule for chanting is: “Sing the words with notes as you would speak them without notes.” This does not imply that the utterance is stiff and mechanical as in ordinary conversation; there is a heightening of the natural inflection and a grouping of notes, as in impassioned speech or the most refined declamation. Like the notes and divisions, the pauses also are unequal and immeasurable, and are determined only by the sense of the words and the necessity of taking breath. In the long florid passages often occurring on a single vowel analogous rules are involved. The text and the laws of natural recitation must predominate over melody. The jubilations are not to be conceived simply as musical embellishments, but, on the contrary, their beauty depends upon the melodic accents to which they are joined in a subordinate position. These florid passages are never introduced thoughtlessly or without meaning, but they are strictly for emphasizing the thought with which they are connected; “they make the soul in singing fathom the deeper sense of the words, and to taste of the mysteries hidden within them.”[55] The particular figures must be kept apart and distinguished from each other, and brought into union with each other, like the words, clauses, and sentences of an oration. Even these florid passages are dependent upon the influence of the words and their character of prayer. The principles above cited concern the rhythm of the chant. Other elements of expression must also be taken into account, such as prolonging and shortening tones, crescendos and diminuendos, subtle changes of quality of voice or tone color to suit different sentiments. The manner of singing is also affected by the conditions of time and place, such as the degree of the solemnity of the occasion, and the dimensions and acoustic properties of the edifice in which the ceremony is held.