The principles and practice of obstetrics . enfully considered. In the second variety, or abnormalor preternatural pregnancy, the ovum never reachesthe cavity of the uterus, but is developed exteriorly,sometimes in the ovaries, sometimes in the walls of theuterus, or finally, in the cavity of the peritoneum, con-stituting the four essential varieties of extra-uterinepregnancy. These have been, apparently unneces- sarily, subdivided according to the position in whichthe ovum may be found in relation to more than oneof the above-named locations : sometimes, for example,the ovum is found covered
The principles and practice of obstetrics . enfully considered. In the second variety, or abnormalor preternatural pregnancy, the ovum never reachesthe cavity of the uterus, but is developed exteriorly,sometimes in the ovaries, sometimes in the walls of theuterus, or finally, in the cavity of the peritoneum, con-stituting the four essential varieties of extra-uterinepregnancy. These have been, apparently unneces- sarily, subdivided according to the position in whichthe ovum may be found in relation to more than oneof the above-named locations : sometimes, for example,the ovum is found covered with the tissues of theovary, and also with those of the tube; or by the ex-terior wall of the uterus, in conjunction with the tis-sues of the Fallopian tube. These are refinements oflittle practical value, and probably are consequential,ensuing on the development of the ovum and the ne-cessary adhesions with the surrounding parts. Ovarian Pregnancy. — By ovarian pregnancy ismeant the retention of the fecundated ovum within the Fig. Ovarian Pregnancy. vesicle of the ovary, so that, as it enlarges, its propertissues receive a covering from the peritoneum, andeventually, also, from its adhesions to the surroundingparts. Why ovarian pregnancy should ever occurmust be problematical. We can easily imagine a pre-ternatural strength in the connections between theovule and the granular body or other portions of the vesicle, or an unusual thickness or firmness of theperitoneal investment, preventing ovi-position. It is so improbable, a priori, that this variety ofextra-uterine pregnancy should occur, that very manyhave positively denied its existence; but, as we havereason to believe, from facts already mentioned, that,fecundation may occur in the vesicle of the ovary, the (626) OVARIAN. —TUBAL. 527 probability of ovarian pregnancy is less wonderful,while positive cases, adduced by many excellent andpractical anatomists and pathologists, seem to leave nodoubt of its occasional
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