SECT. III. SPECIFIC EXAMPLES. 381 



longation of the umbilical cord into the figure of an 

 inverted cone, as described by Malpighi.* 



On the 2d, the induration of the pyrena was con- 

 siderably augmented ; and the sacculus colliqua- 

 menti and amnios, though not distinguishable on the 

 longitudinal or transverse section of the nucleus, were 

 yet separable from the chorion by means of a little 

 manipulation. The embryo was not yet perceptible. 



On the 4th, the umbilical cord, or sacculus, ex- 

 tending throughout the length of the chorion, was 

 now visible on the longitudinal section for the first 

 time ; together with the embryo occupying the upper 

 region of the amnios, and measuring about the -j-i-g. 

 part of an inch. The seed lobes were perfectly dis- 

 tinct, resembling a pear cleft half way down from 

 the apex, but swelling a little where they unite, and 

 then terminating in a small point directed to the 

 circumference. This point was the radicle, which 

 began to assume a yellowish tinge immediately 

 upon being exposed to the air. The envelope of 

 the nucleus seemed as if about to separate into two 

 portions the testa and subtesta, or exterior and 

 interior integuments of Gaertner. 



On the 5th, the chorion was somewhat shrunk, 

 and the umbilical cord passing through it had as- 

 sumed a curvilinear position, as described by Mal- 

 pighi. The embryo measured about T 1 T inch. 



On the 9th, the embryo measured about ~ T inch, 

 but was flatter in its appearance than before. The 

 * Opera' Omnia. DC S'em. Gener, 



