Abstract
Summary Two aspects of the etiology of breech presentation have been considered. First, it has-been found that the “classical factors” (contracted pelvis, pelvic tumors, placenta previa, and fetal malformation) in the aggregate account for only one-sixth of the breech births among mature single infants. Second, the data which have been assembler) suggest that extension of the legs may be a causative factor rather than a resultant effect in breech presentations. The mechanism by which extension of the legs may operate to affect the presentation has not been fully discussed here. It is the writer's hope that within a few years he will be prepared to report current experiments which deal with the effects of gravity and of the contour of the fetal mass upon polarity. At, that time, a review and correlation will be made of many important fundamental publications which have not been alluded to in the present study.
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