For our own part we must confess, that, although we have seen this application tried repeatedly, it has never produced the desired effects, but has invariably brought on very troublesome and distressing symptoms, such as sickness, faintness, headach, vertigo, &c. There is a condition of the os uteri which is occasionally met with, and which presents a degree of rigidity which we have never seen except where there have been adhesions and callous cicatrices from former injuries. It has nothing of the thin edge put strongly on the stretch during the pains; but it is thick and firm, presenting nothing of the elastic cushiony softness of the os uteri in a favourable state for dilatation; it dilates to about an inch across, tolerably regularly, and without much apparent difficulty, but no efforts of the uterus can dilate it farther. We have already alluded to two extreme cases of this when speaking of ruptured uterus, and where in each instance the os uteri entirely separated from the uterus and came away. Whether there is something peculiar in the structure of the part which renders it thus undilatable, or whether it required even still more powerful measures than those employed, is not very easy to decide. _Edges of the os uteri adherent._--_Cicatrices_, &c. A serious impediment to the passage of the child may be produced by adhesions of the sides of the os uteri to each other; by hard callous cicatrices resulting from ulcerations, lacerations, &c. in former labours; by abnormal bands, or bridles, as they have been called; and by tumours and other morbid growths. Where the structure of the os uteri has been much injured by previous injuries of this character, the resistance will probably be so great as to require artificial dilatation with the knife. Generally speaking, however, the whole circle of the uterine opening is not involved, portions still remaining of natural structure, and, therefore, capable of dilatation. On examination, it feels irregular both in shape and hardness; a part being soft, cushiony, yielding, and forming the segment of a well-defined circle, the rest of it uneven, knobby, and hard, being evidently puckered up by cicatrisation. In many cases, these callous contractions give way more or less when the head begins to press powerfully against them; but even where this is not the case, the healthy portion of the os uteri is so dilatable as to yield sufficiently. It would be difficult to estimate how far an os uteri in this state, with perhaps, not more than half, or even a third, of its circle in a healthy condition is capable of dilating. But from cases which have come under our own observation, and others which have been recorded by authors in whom we place the greatest reliance, we are quite confident that with proper treatment a sufficient degree of dilatation can be effected without resorting to artificial means.