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There are four methods by which the diameters of the pelvis may be measured: (1) The diagonal conjugate may be obtained and the true conjugate estimated from it by subtracting 1.5 to 2 cm., (2) X-rays may be directed into the pelvic inlet by the technique of Thoms, Torpin, and others, (3) X-rays may be directed lateral to the pelvic inlet by the technique of Thoms, Jacobs and others, and finally, (4) the patient may be operated upon and the true conjugate measured directly. Classification of the architecture of the pelvis is possible by the use of the x-ray. Several classifications are available. The more recent stem from the work of Turner and are based on morphology. Caldwell, Moloy, and Thoms have led in this work. They have borrowed extensively from the anthropologist, basing their classification on the contour of the pelvic inlet. This study is undertaken with the purpose of comparing the antero-posterior diameters of the pelvis obtained by the four methods outlined above. Such a comparison should assist us in evaluating the meaning of the diagonal conjugate; it should further assist us in formulating an opinion as to the accuracy of x-ray pelvimetry. Furthermore, if in addition to diameters, the structure and contours of the birth canal are studied both by x-ray and physical means, we are aided in the clinical evaluation of the female pelvis.

In a study of occipitoposterior positions of the vertex, one should turn to the three fundamental branches of medicine—anatomy, physiology and pathology—in order to obtain the foundation for the understanding of this complicating obstetric problem. The anatomy should include the normal female pelvic measurements and the normal measurements of the fetal head. The physiology should give one the mechanism of the engagement of the fetal head in a maternal pelvis, and the pathology the abnormal factors present when the fetal head tries to engage in the posterior position. It should explain how this position differs from the normal engagement of the occiput anterior. The fetal head presents at the pelvic brim in a military attitude, sitting erect on the shoulders. The diameters opposing each other are the occipitofrontal of from 11 to 11.5 cm. and the suboccipitobregmatic of from 9 to 9.5 cm., while the normal pelvis presents at the

North Carolina took its initial step in, clinical cancer controlon April 27, 1948, with the opening of the New Hanover County Cancer Center. This statewide project is directed by the Division of Cancer Control of the state board of health, with the Cancer Committee of the State Medical Society and the North Carolina Division of the American Cancer Society as collaborators. Cooperating agencies within the state board of health are the Divisions of Oral Hygiene, Industrial Hygiene, Laboratory of Hygiene, Tuberculosis Control, Local Health, Epidemiology and Preventive Medicine. The Cancer Committee of the state medical society assists the state health officer and the director of the Division of Cancer Control in, formulating plans and policies that are practical and acceptable to the private practitioner, on whom a great part of the success of this program depends. The state division of the American Cancer Society with other local organizations assists by