found in the human Placenta. 
sent to the tumour ; which was situated behind the chorion, 
and lay imbedded in the foetal portion of the placenta. The 
general form of this tumour was oval, about four inches and 
a half long, and three inches broad. The thickness of it was 
about three inches. It weighed upwards of seven ounces. 
Its shape resembled that of a human kidney; one edge being 
nearly uniformly convex, whilst the other, where the vessels 
approached it, was a little hollowed. 
The general character of the surface of the tumour was con- 
vexity; but in some parts of it there were slight indentations, 
more particularly in the course of the large vessels. 
The whole of the tumour was inclosed in a firm capsule, in 
the substance of which the large vessels were contained, nearly 
in the same manner as they are found in the dura mater. In 
the interstices of the vessels, the capsule did not appear to be 
vascular ; at least there were no vessels capable of carrying the 
injected matter. 
The blood-vessels, branching off from the funis to supply the 
tumour, partly went over one side, and partly over the other 
side of the tumour ; ramifying as they ran, till, meeting at the 
convex edge of the tumour, they anastomosed very freely. 
From the large trunks on the surface, small branches were 
given off, penetrating into the substance, and supplying the 
whole tumour with blood. 
Upon making a section through the tumour, in the direction of 
its length, the consistence was found to be uniform, firm, and 
fleshy, very much resembling, in this respect, the kidney. The 
cut surface, upon examination, had somewhat of a mottled ap- 
pearance ; some parts being highly vascular, whilst others were 
white and uninjected. 
