. A study of the causes underlying the origin of human monsters : third contribution to the study of the pathology of human embryos . ting cells lying between the embryo and the envelopeof magma. No. 97. Ovum, 33 x 30 x 15 mm.; embryo, C. R., 7; A. R., 9 mm. Dr. Goldman, Baltimore. Beginning of last menstrual period, March 8, 1897. Abor-tion, May 8. The entire ovum was hardened in 95 per centalcohol. The ovum appears normal with the villi distributed equallyover it. Upon opening, it was found filled with dense magmareticule, in which could be discerned the faint outline of afour-weeks embryo.
. A study of the causes underlying the origin of human monsters : third contribution to the study of the pathology of human embryos . ting cells lying between the embryo and the envelopeof magma. No. 97. Ovum, 33 x 30 x 15 mm.; embryo, C. R., 7; A. R., 9 mm. Dr. Goldman, Baltimore. Beginning of last menstrual period, March 8, 1897. Abor-tion, May 8. The entire ovum was hardened in 95 per centalcohol. The ovum appears normal with the villi distributed equallyover it. Upon opening, it was found filled with dense magmareticule, in which could be discerned the faint outline of afour-weeks embryo. A block of the chorion, including magmaand embryo, was cut into serial sections. The form of the embryo, amnion and umbilical vesicle isnormal. On one side of- the embryo the epidermis is wantingand the amnion is filled with cells. The umbilical vesicle is 182 MALL. [Vol. XIX. filled with migrating cells, but its blood islands and its ento-derm appear normal. The chorion is fibrous. The outercovering of the vesicle is composed of a short layer of col-umnar epithelial cells. The magma of the ccelom is filled withwandering Fig. 97.—External surface of the chorion. Natural size. The nervous system is greatly dilated and dissociated. Theliver tissue is obscured and filled with migrating cells. Thecontour of the abdominal viscera is obliterated and they arelikewise filled with migrating cells. Pharynx, heart, largeveins and aorta are greatly dilated. No. 104. Ovum, 35 x 35 x 15 mm.; embryo elongated, 12 mm. curled upon itself it would measure, C. R., about 7 mm. Dr. J. P. West, Bellaire, Ohio. The beginning of the last menstrual period was on May7, and the abortion took place on June 11, 1897. The entireovum was preserved in strong alcohol. The villi of the chorion appear atrophic, being wanting onone side of the ovum. After the ovum was carefully cut inhalf it was found filled with magma partly reticular and partlygranular. On one side is a snake-like embryo with
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