If it be true that the welfare of one part of the body is bound up with that of every other, as are the interests of one member of a firm with those of another, in a great business, it will at once appear that the most perfect results can follow for the voice-user only under certain conditions. However perfect by nature the vocal mechanism, the result in any case must be largely determined by the character of the body as a whole. The man of fine physique generally has naturally more to hope for than one with an ill-developed body.
In the natural working of the body the stimulus to a muscle is nervous; hence we may appropriately, and often to advantage, speak of neuro-muscular mechanism, the nervous element being as important as the muscular.
In a later chapter it will be shown that the work of the singer and speaker when most successfully carried out must be largely reflex in nature—a fact on which hang weighty considerations with regard to many questions, among them methods of practice, the influence of example, etc.—be he ever so much the natural artist. It will be the writer's aim, however, to give such warnings and advice as may assist each reader in his own best development. Many who began with a comparatively poor physical stock in trade have surpassed the self-satisfied ones who trusted too much to what nature gave them. Singers as well as others would do well to believe that Labor omnia vincit.
SUMMARY.
The same fundamental physiological principles apply to the lowest and to the highest animals. To all belong certain properties or qualities. As structure is differentiated, or as one animal differs from another owing to greater or less complexity of form, there is a corresponding differentiation of function, none, however, ever losing the fundamental properties of protoplasm. Each organ comes to perform some one function better than all others. This is specialization, and implies advance among animals as it does in civilization.
The neuro-muscular system is of great moment to the voice-user. He is a specialist as regards the neuro-muscular systems of the vocal mechanism. But the same laws apply to it as to other neuro-muscular mechanisms. It is of great theoretical and practical importance to recognize this, and that one part of the body is related to every other, which relationship is maintained chiefly by the nervous system, and largely through reflex action.