=Sacrum.=—Examination of the sacrum is best made with the patient lying on the side, with the osteopath standing in front and with the hand palpate its posterior surface. In the sitting posture its relation with both innominates can be determined. It is displaced posteriorly but seldom, the most frequent being anterior, downward, and a combination of the two. In the anterior conditions tenderness at the sacro-iliac articulations is a good point, but it must not be confounded with an innominate lesion. The downward displacement is shown by comparison with the lower lumbar vertebræ. Observe the relation between the two, as a change in contour of the spine will also change the angle of the sacrum and _vice versa_. =Coccyx.=—With the patient and operator in same position as for the sacral examination outline the coccyx, as to first, =contour=; second, =rigidity=; third, =sensitiveness=. If abnormalities are detected go to the other side of the table and with a well lubricated index finger palpate its anterior surface. Changed contour, displacements, and old fractures can be readily determined. The most common deviation is anterior at its union with the sacrum. The lateral form generally resulting from muscular contraction is next, with posterior but seldom. “If the lower part of the sacrum is rotated backward, the sacro-coccygeal articulation or angle is affected or becomes more acute, since the tip of the coccyx is not displaced, but held in position by structures attached to it. If the sacrum is displaced downward the effect is about the same. Often this sort of sacral lesion is mistaken for an anterior luxation of the coccyx.”[28] Remember that normally there should be some movement of the coccyx. It has a fibro-membranous articulation. =Uterine=, =ovarian= and =rectal= examinations are largely of the same nature as those given by other practitioners, although osteopaths find that oftentimes other practitioners are mistaken in regard to the etiology of many diseases to which these organs are subject.