_Rules for finding the feet._ In searching for the feet we must endeavour to gain the anterior surface of the child, for (unless its position be greatly distorted) they are usually turned upon the abdomen: in arm presentations the position of the hand will also guide us, the palm of it being mostly turned in the same direction as the abdomen, and therefore points to the situation of the feet; the rule also, as above given by Boer, of passing the hand along the inside of the presenting arm, is well worthy of recollection, for this can scarcely fail to guide us to the anterior part of the child. Where, either from the pressure of the uterus or other circumstances, it is difficult to distinguish the precise position of the child, it will be better to follow Dr. Denman's simple rule, that the hand "must be conducted into the uterus, on that side of the pelvis where it can be done with most convenience, because that will lead most easily to the feet of the child." The soft abdomen, the curved position of the child, and its extremities crossed in front are so many reasons why there should be more room in this direction. During all this time the other hand placed externally will be of great service, not only in supporting the uterus, but in fixing the child and rendering the different parts of it more attainable. Where the feet are at some distance, we frequently come first to an arm or thigh, which soon leads us to the elbow or knee; if the introduction of the hand has been attended with some difficulty, it will not be very easy to distinguish these joints from each other, without bearing in mind the following diagnostic points:--the knee present two rounded prominences (condyles of the femur) with a depression between them, whereas, the elbow presents also two rounded prominences, but with a sharp projection (olecranon) between.