from the ovarium to the uterus in women. 261 
structure of the corpus luteum is readily distinguished, of the 
form of an irregular oval. Towards the other end of this 
ovarium is the transverse section of a corpus luteum, not far 
enough advanced in its growth to have a cavity in which the 
future ovum is to be generated, the whole having one uniform 
glandular structure, the general form, like that of the other, 
being irregularly oval. The orange colour, peculiar to the 
glandular structure of the corpora lutea, which is very bright, 
and forms their distinguishing character, is not given, as the 
drawing is intended to be engraved. 
Explanation of Plates VIII, IX, X, XI. 
Plate VIII. 
The uterus laid open from behind, showing the ovum in the 
situation in which it was discovered. The other parts require 
no description. 
Plate IX. 
The right ovarium laid open, showing the orifice at which 
the ovum escaped. The Fallopian tube laid open through its 
whole length. All these parts are minutely described in the 
Paper. 
Plate X. 
The left ovarium and Fallopian tube laid open. 
Plate XL 
Different views of the ovum. 
Fig. 1. The ovum represented of its natural size. 
Fig. 2. The ovum magnified, exposing that side which is 
covered by one uniform membrane. 
Fig. 3. The opposite side exposed, to show that the external 
membrane is disunited through its whole length, and unat- 
tached to the one under it. 
Fig. 4. The two disunited edges of the outer membrane 
turned aside, exposing the inner membrane, through which 
are seen two very slight protuberances, the probable seat of 
the future heart and brain. 
