This Plate shows the position of the Fœtus in a presentation of the Pelvis, or breech, which happens, comparatively, but seldom.] PLATE XXII. This represents the position of Twins, as most usually observed, one having a head presentation, and the other a breech. The black spot _a_, on both, denotes the position of the heart, which in one case is above the line, and in the other below. The head however, may be on the right side instead of the left, and so reverse the position of the two hearts, but this is very seldom the case. When there are more than two, the confusion and uncertainty becomes still greater. [Illustration: Plate XXII. This represents the position of Twins, as most usually observed, one having a head presentation, and the other a breech.] At this period the signs previously observed become more distinct, but there are few new ones. The external lips sometimes swell, and the breathing becomes more difficult, owing to pressure on the diaphragm. The trouble with the urine is also apt to increase, and little mucus tubercles, like pimples, occasionally form around the Os Tincæ, and on the upper part of the Vagina. _End of the ninth month._--There is but little difference between this and the previous period. The mouth of the Uterus is more open, and, in those who have had children, the finger will pass directly into the Womb, and feel the child, but in primipara there is still a small portion of the neck left. [Illustration: PLATE XXIII. Fig. 1. The neck of the Womb, at near the end of nine months in a primipara. Fig. 2. The neck of the Womb, at near the end of nine months, in a woman who has previously borne children.] Ballotment is now more obscure than before, as the Fœtus is very heavy, and quite low down, and pretty firmly fixed. Auscultation is distinct enough, but not more so than at the previous period. The swelling of the lips, and of the veins of the legs, may increase, and so may the difficulty with the urine; but the breathing generally becomes easier, owing to the Womb having descended a little, and so pressing the diaphragm less.