192 MALL. [VoL. XIX. 
swollen and appeared perfectly normal. The formalin, how- 
ever, at once caused the coagulation of a delicate network of 
fibrils which enveloped most of the embryo. The sections 
show a delicate reticulum of fibrils within the amnion. 
No. 130. 
Ovum, 15 x 10 x 6 mm; vesicle within, 4 x 3 x I.5 mm. 
Dr. De Saussure, Charleston, S. C. 
“The specimen was passed by the patient while urinating, 
14 days after the beginning of the last menstrual period. She 
had no idea that she was pregnant and thought that the 
specimen was a piece of mucous membrane from the bladder. 
It was hardened entirely in 50 per cent alcohol.” 
When the specimen came into my hands it was only half 
covered with villi, the other half apparently having had them 
stripped off. There was also a tear in the chorion through 
which a vesicle was protruding. Upon lifting the ovum this 
vesicle fell out. The ovum was then carefully cut open and 
Fic. 130a—Ovum with extruded vesicle. Natural size. 
was found to contain a considerable quantity of magma re- 
ticulé. Within this there was a long pedicle, measuring 7 x 2 
mm. There was also a space in the magma large enough to 
hold the vesicle which had escaped. Both ovum and vesicle 
were cut into serial sections. 
The serial sections of the ovum show that the amnion is 
still unbroken, as shown in Figs. b, c, d. Its greatest meas- 
