When a woman is pregnant with two children, they rarely present to the birth together, the one generally being more forward than the other; and that is the reason that but one is felt, and that many times the midwife knows not that there are twins till the first is born, and that she is going to fetch away the after-birth. In the first chapter, wherein I treated of natural labour, I have showed how a woman should be delivered of twins, presenting themselves both right; and therefore, before I close the chapter of unnatural labour, it only remains that I show what ought to be done when they either both come wrong, or one of them only, as for the most part it happens; the first generally coming right, and the second with the feet forward, or in some worse posture. In such a case, the birth of the first must be hastened as much as possible, to make way for the second, which is best brought away by the feet, without endeavouring to place it right, because it has been, as well as its mother, already tired and weakened by the birth of the first, and there would be greater danger of its death than likelihood of its coming out of the womb that way. But if, when the first is born naturally, the second should likewise offer its head to the birth, it would be then best to leave nature to finish what she has so well begun; and if nature should be too slow in her work, some of those things mentioned in the fourth chapter, to accelerate the birth, may be properly enough applied: and if, after that, the second birth should be yet delayed, let a manual operation be deferred no longer; but the woman being properly placed, as has been before directed, let the operator direct his hand gently into the womb to find the feet, and so draw forth the second child, which will be the more easily effected, because there is a way made sufficiently by the birth of the first; and if the waters of this second child be not broke, as it often happens, yet, intending to bring it by the feet, he need not scruple to break the membranes with his fingers; for though, when the birth of a child is left to the operation of nature, it is necessary that the waters should break of themselves, yet when the child is brought out of the womb by art, there is no danger of breaking them; nay, on the contrary, it becomes necessary; for without the waters are broken, it would be impossible to turn the child.