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Since man is his own love he is also the form of his love, and may be called the organ of his life's love. What these changes and variations are and their nature will be explained now. Some idea of them may be obtained from the alternating expansions and compressions or dilations and contractions in the heart and lungs, called in the heart systole and diastole, and in the lungs respirations.
Therefore the heart of a living creature is triangular, having its least part towards its left side, and the greater towards the right; and doth also open and shut in the least part, by which means it is in continual motion; the first motion is called diastole, that is extending the heart or breast; the other systole, that is, shutting of the heart; and from these all the motions of the body proceed, and that of the pulse which the physicians feel.
From these facts it is manifest, in opposition to commonly received opinions, that the diastole of the arteries corresponds with the time of the heart's systole; and that the arteries are filled and distended by the blood forced into them by the contraction of the ventricles; the arteries, therefore, are distended, because they are filled like sacs or bladders, and are not filled because they expand like bellows.
Then he proceeded to study the action of the arteries and showed that their period of diastole, or expansion, corresponded with the systole, or contraction, of the heart, and that the arterial pulse follows the force, frequency and rhythm of the ventricle and is, in fact, dependent upon it.
It seemed but a part of the process that every year the instruments of war were vaster and more powerful, and that armies and explosives outgrew all other growing things.... Three hundred years of diastole, and then came the swift and unexpected systole, like the closing of a fist. They could not understand it was systole.
In cases however of debility from paucity of blood, as in animals which are bleeding to death in the slaughter-house, the quick pulsations of the heart and arteries may be owing to their not being distended to more than half their usual diastole; and in consequence they must contract sooner, or more frequently, in a given time.
The left auricle finds it difficult to empty all of its blood into the left ventricle during the ordinary diastole of the heart. This auricle then somewhat hypertrophies, but is unable to prevent more or less damming back of the blood into the lungs through the pulmonary veins.
Moreover, and contrary to the general opinion, neither the heart nor anything else can dilate or distend itself so as to draw anything into its cavity during the diastole, unless, like a sponge, it has been first compressed and is returning to its primary condition.
In the same way, when we see the blood in arteriotomy projected now to a greater, now to a less distance, and that the greater jet corresponds to the diastole of the artery and to the time when the heart contracts and strikes the ribs, and is in its state of systole, we understand that the blood is expelled by the same movement.
The womb must surrender some of that blood, the glands return to their routine, and a sex diastole of the whole organism succeeds. Until again, another follicle swells, another ovum matures, and the premenstrual state of sex high tide cycles back. Seven to ten days before menstruation we know that sex high tide is beginning for that is when the blood pressure goes up.
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