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XIII. Description of an extraordinary Production of Human 
Generation , with Observations. By John Clarke, M. D . 
Communicated by Sir Joseph Banks, Bart. P. R. S. 
Read May 1 6, 1793. 
In the course of the last year, a woman was admitted into 
the General Lying-in Hospital, in Store Street, Tottenham- 
court Road, who, after a natural labor, was delivered of a 
healthy child. 
The birth of this child was succeeded, however, by a repeti- 
tion of uterine contractions, by which another substance was 
expelled, which is the subject of this paper. 
It was inclosed in a distinct bag of membranes, composed 
of decidua, chorion, and amnios, and had a placenta belong- 
ing to it ; the side of which was attached to the placenta of 
the perfect child. The membranes had been opened before I 
saw it, and a small quantity of liquor amnii having been dis- 
charged, the contents of the cavity were exposed. 
The substance contained in the membranes was of an oval 
figure, rather flattened on the two sides. Its long diameter 
was about four inches ; and its short diameter, from edge to 
edge, three inches. One edge was rather more concave than 
the other, and near the centre of it there was a small and thin 
funis, in length about an inch and half, by means of which it 
was connected to the placenta. 
