. The science and art of midwifery . Figs. 86, 87.—Diagrammatic representations ,>f ions through the infantile and adult pelves. iSehroeder. i lower; the iliac incline approaches more nearly a vertical line; thepubic arch is less acute; and the transverse diameter is increased. The most important agent in effecting the changes which char-acterize the adult pelvis is unquestionably the weight of the to the wedge-shape of the sacrum, and the shelf-like ledgewhich projects from the lower surface of the iliac articulation, no dis-placement can take place in the direction of tin
. The science and art of midwifery . Figs. 86, 87.—Diagrammatic representations ,>f ions through the infantile and adult pelves. iSehroeder. i lower; the iliac incline approaches more nearly a vertical line; thepubic arch is less acute; and the transverse diameter is increased. The most important agent in effecting the changes which char-acterize the adult pelvis is unquestionably the weight of the to the wedge-shape of the sacrum, and the shelf-like ledgewhich projects from the lower surface of the iliac articulation, no dis-placement can take place in the direction of tin long axis of the au-ricular surfaces. But, when we bear in mind the inclination of thepelvis, it is obvious that pressure from above must act upon the sa-crum likewise in a downward, forward, and inward direction. Now, ifthe sacrum were, as it is sometimes represented, the key-stone of thepelvic arch, its position would be lived between the ilia. We owe to L56 LABOR. Duncan,* however, the demonstration that this view is incorrect
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