Tonicity is the normal elasticity of the filamentary or threadllike structures of the body, the nervous system. To innervate is to supply with nerve-force. To enervate is to deprive of nerve-force. An impulse is a communicated thought. Impulses are conveyed over the nervous system by means of vibration.
Thoughts originate in man, animal and spirit.
They are forwarded by atmospheric and etheric vibration. In spoken language by the former and by the latter where the affections of one mind are acted upon by the thoughts or emotions of another without communication through the ordinary channels of sensation, viz., the five senses. There are two kinds of impulses, sensational and motor. Motor impulses go outward and sensational inward. A sensational impulse is one which comes from without, one which creates within us sense impressions of our environments.