The subsidence of the lower end of the uterus into the pelvis, however, causes many unpleasant symptoms. The pressure upon the bladder renders a frequent evacuation of its contents necessary; there is often an ineffectual desire to urinate, and sometimes strangury. There is often a sense of weight about the anus, an irritable state of the bowels, occasional griping pains, and a desire to go to stool when but little is passed, and sometimes diarrhœa. The œdema and varices of the lower extremities augment, the hemorrhoidal vessels swell up, and the piles are larger. These precursory symptoms are manifested more in primapara than in others. To some, walking becomes at this time impossible.

There are during the last month, and especially toward the close of it, painless uterine contractions; there may be at first a sort of squeezing sensation with it. But about twenty-four hours previous to the commencement of actual labor, these contractions are accompanied with some pain and are periodical, recurring perhaps every twenty or thirty minutes. If an examination be made of the os tincæ at the COMMENCEMENT OF LABOR it will be found that the rounded collar of the os is already effaced. The pains then suddenly become acute, and it can be observed that the uterus contracts if we notice its greater hardness and roundness during a pain. The os uteri if somewhat dilated closes partially with each contracting, and it can be observed that its margins are growing thinner though tense and resistant at the time of the pain.

The contractions distend the membranes; these are first pressed on the neck, then into it, then as soon as the dilatation is sufficiently advanced engage in it in the form of the segment of a sphere, whose dimensions progressively increase with the dilatations.

There is now and perhaps has been for several hours a glairy discharge from the vagina, which becomes streaked with blood, there are perhaps shiverings or rigors (not accompanied with a cold skin), the pains increase in force and frequency, the pulse is hard, full, and rather frequent, the countenance is flushed, often there is vomiting, and the patient is prone to despond and be discouraged.

She is less agitated after the pain subsides, though it does not cease entirely. During the interval the margins of the os again become supple, the membrane that was tense while the pain lasted becomes flaccid, and the child’s head can be more plainly felt. As the contractions are repeated the os uteri dilates more and more until it is completely opened and no part of its margin can be touched; though very frequently from some obliquity of the uterus, the margin on one side can be observed pushed down before the head of the child, while that on the other side cannot be reached. In ordinary cases the membranes are ruptured and the waters escape at the commencement of the second stage, and the time occupied by the first stage is nearly three-fourths that for the whole labor. But the duration of the stages as well as the time occupied by the parturition is exceedingly variable, and the same may be said in regard to the duration and character of the pain.

We may observe here that pain is nearly inseparable from the contractions of the uterus, so that in common language the two expressions are used indifferently; but using the word in its ordinary sense the pain in the first stage of labor is different from that in the second. What are called grinding pains characterize the first part of labor, and although they differ in different individuals, they are pretty generally so severe as to cause the patient to cry out. As soon as the labor advances to the second stage there is a change in the character of the pains. They are more frequent and longer and the intervals shorter; but though the suffering may be greater the cry is more suppressed, the bearing down is carried to a greater degree, and each pain is succeeded by a calm more perfect than that in the first stage. Should the interval be rather long some patients get a little sleep between the pains, but if there has not been a bursting of the waters previously there is generally now a pain sufficiently hard to break the membrane.

Either in the first or last part, or during the whole of the labor, the woman says that the pain is in her back, it being in the lumber and dorsal region; the grinding pain she speaks of as being forward, they seem however to go through from the umbilicus to the sacrum. In cases where there is rigidity of the uterine orifice, there is I believe pain especially in the back; and when the os becomes fully dilated, the pains are bearing down; the patient at the accession of a pain holds her breath, and seizing hold of something with her hands, brings the muscles of the back and abdomen and extremities to aid the expulsive efforts of the uterus. I do not doubt that this straining of the mother at this time is advantageous; these efforts of the mother should not be encouraged, however, at the first part of the labor, because then they do no good, nor at the very last, as combined efforts then may rupture the perineum.

As the head advances through the pelvic cavity the pressure upon the nerves which pass through it gives rise to cramps in the thighs and legs.

As the head passes into the vagina the walls become flabby and the canal seems to enlarge and elongate and to be prepared to yield to the pressure of the head. If an internal examination be made the head will be perceived filling the cavity, descending with each pain and receding at its conclusion—the advance ordinarily exceeding the recession, though sometimes the gain is not perceptible. When the head rests on the perineum, that offers some resistance, which seems to stimulate the uterus and abdominal muscles to greater efforts and more forcible contractions.

If it be a first labor there may be at this point a little delay in its progress. But the fœtal head being forced down by the rapidly recurring pains so presses against the floor of the pelvis that it yields and becomes bulging in front, and distended, though there still is recession as the pain intermits. But adequate force is called into action; each pain gains upon the advance made by its predecessor; the vulva partially opens, and at each pain they open more and more; the resistance of the parts is finally overcome. After the perineum has given the head its proper direction in its transit, there usually comes a hard pain—forcing a loud cry from the woman—another pain succeeds immediately, which expels the head altogether from the parts; then after a short rest the uterine power is again exerted to expel the body of the child.