As the voice assumes the intenser modes of force, the vocal organs become more and more compressed, and utterance is more and more labored; the breath forced out cannot all be vocalized; the voice becomes less and less pure, and manifests itself in the aspirate and guttural qualities. _Hence, strongly suppressed utterance in impure vocality, rather than mere loudness in pure vocality, is the appropriate expression for all the intenser passions._ III. STRESS. Stress is force considered with respect of the form of its application to the concrete. Since the equable concrete is the natural colorless expression of unimpassioned thought, force applied to any part of it changes its character, and gives it a more or less significant emphasis. The three most usual forms of stress are the _radical_, the _median_, and the _final_; these may be effected in any of the degrees of force. _Compound stress_ and _thorough stress_ admit of but little variation. =Radical Stress=, to some extent an essential, but not an expressive element in the equable concrete, is, in a somewhat stronger form, an element in all utterance that is intended to be vivid and energetic, emphasizing these characteristics by its own incisive clearness. The more animated and energetic the diction the clearer and more determined should be the opening of the concrete, that is, the more distinct and forcible should be its radical stress; while in graver language the radical stress is less pronounced. In its emphatic degree it ought at no time to be allowed to become a current mode, imparting its peculiar incisive character to every syllable; though, for especial emphasis, it may be appropriately used in this way in the utterance of the several words of a phrase. =Final Stress= differs from radical stress principally in this, that while it equally indicates energy and positiveness, it does so as in accordance with predetermination and reflection. _Radical stress denotes, as it were, an involuntary state of energy; final stress, the energy or fixedness of resolve._ Hence, final stress is appropriate to the expression of resolution, of obstinacy, of earnest conviction, of passionate resolve. It emphasizes the characteristics of wide intervals, giving to rising intonations a more decidedly interrogatory character, and making falling intonations more vehemently and passionately positive.