262 MALL. [Vo.. XIX. 
No. 264. 
Ovum, 25 x 20 x 15 mm., with a cavity within 10 mm. in 
diameter. 
Dr. Gardner, Baltimore. 
“Last period occurred on August 12; abortion October 9; 
but the menses had been irregular for three months before.” 
The ccelom is filled with hard hyaline magma, rich in round 
cells, in which is imbedded the umbilical vesicle measuring 
21% mm. in diameter. The chorion is thickened and fibrous 
and is covered with some villi, which are also fibrous. The 
vesicle shows all the characteristics of the umbilical vesicle 
and is attached to the chorion by a thick fibrous pedicle. At 
the point of juncture it is rich in large blood-vessels filled with 
blood. These radiate into the surrounding chorion, but do 
not reach into the villi. 
No. 268. 
Embryo, ©. Rey 22mm: 
Dr. Kammerer, New York. 
The form of the embryo is normal, but its body is straighter 
than usual. It was hardened in formalin and some of the 
tissues are well preserved, but others, ¢. g., brain, liver, lungs 
and muscles, are dissociated. The blood-vessels are filled with 
blood and there are no wandering cells in the tissues. Compare 
the form of this embryo with that of No. 256, Plate IIT, 
Fig. 8. 
No. 270. 
Ovum, 40 x 30 x 30 mm.; embryo, C. R., 14 mm. 
Dr. Wilson, Baltimore. 
The chorion is only partly covered with villi, which are 
atrophic and fibrous in structure, but contain some blood- 
vessels in them. The main wall of the chorion is also fibrous 
and of irregular thickness, with some blood-vessels in it. The 
amnion has reached the chorion and is filled with granular 
magma, which completely envelopes the embryo. 
The central nervous system is distended, dissociated and 
macerated. The large blood-vessels and heart are distended 
