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Cases of too frequent nocturnal emissions accompanied by languor and headache are usually caused by irritability or lack of tonicity of the sexual apparatus, particularly of the seminal vesicles and the ducts.
Work thus became the great law, the regulator of the living universe. Hence it became necessary if the equilibrium were broken, if the external excitations ceased to be sufficient, for therapeutics to create artificial excitations, in order to reestablish the tonicity which is the state of perfect health.
It means only that the opposed sets pull in contrary directions. Each opposed set consists of muscles of about equal strength. Under normal conditions of relaxation the entire muscular system exerts a slight degree of contraction. To this normal state of oppositional contraction the name "muscular tonicity" is given.
Increased arterial tone or tonicity necessitates greater cardiac effort, to overcome the resistance, and hypertrophy of the heart must follow. This hypertrophy always occurs if the peripheral resistance is not suddenly too great or too rapidly acquired. In other words, if the peripheral resistance gradually increases, the left ventricle hypertrophies, and remains for a long time sufficient.
It is evident, then, that any local hardening or contracting of muscle, any tension or contraction which would prevent elasticity, would make the removal of all restraint impossible. Hence we find that this first principle is an impossibility with the rigid local-effort school. On the other hand, relaxation, while it may remove restraint, makes artistic control and tonicity impossible.
But if stimulation of the brain does not paralyze, it must increase the tonicity of the vaso-motor centre, and hence the force and regularity of the circulation. Up to a certain point, these characters do indeed increase, with increase of pressure in the cerebral blood-vessels.
For it was these sensations which, reverberating in the brain, in the marrow, and in the nervous centers, were there converted into tonicity, movements, and thoughts; and he was convinced that health consisted in the natural progress of this work, in receiving sensations, and in giving them back in thoughts and in actions, the human machine being thus fed by the regular play of the organs.
There is no more harm in dancing at fifty than at fifteen and not so much danger. The relaxation of muscles and sagging of the face are as much the result of mental attitude as of loss of tonicity. Thinking young and associating with children are helpful and healthful. People who are very stiff and dignified are mentally sterile.
It is, moreover, extremely frequent. Others exist, but are more rare as peculiar congenital predisposition to hæmorrhages, with or without true hemophilia . If the menstrual crisis finds the uterine blood-vessels already deprived of tonicity through nervous exhaustion or other cause, hæmorrhage is as likely to occur as if that tonicity were only exhausted at the epoch of menstruation.
It should be well recognized that prolonged high fever, prolonged insufficient or improper nutrition, prolonged acute pain, and especially prolonged septic processes will always cause myocardial degeneration. It should be recognized that after ether and chloroform anesthesia, especially after chloroform, the heart muscle may be disturbed and the tonicity be lost.
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