SECT. III. SPECIFIC EXAMPLES. 



which proved to be a cavity generated in the centre, 

 the nucleus now measuring of an inch. In some in- 

 dividuals two cavities were perceptible, the one cen- 

 tral, the other towards the circumference. 



On the 10th, when the nucleus of a seed measur- 

 ing about T V of an inch in diameter was cut open, the 

 cavity, which was now considerably enlarged, was 

 found to be filled with a thin and transparent fluid. 

 This fluid was the amnios, but the embryo was not 

 yet perceptible. 



On the 13th, when a legume was opened which 

 has acquired nearly its full length, and of which 

 the nucleus measured one fifth of an inch in diame- 

 ter, the embryo was perceptible floating in the upper 

 region of the amnios, and measuring ^V of an inch in 

 length ; the two lobes being expanded somewhat in 

 the shape of a horseshoe, but without any apparent 

 attachment to the sides of the cavity. The radi- 

 cle was not yet distinguishable, nor the plume- 

 ^et ; but there was a protuberance in the cleft of the 

 lobes. 



On the 1 5th, when the nucleus measured one-fourth 

 of an inch in diameter, the embryome&sured one-eighth. 

 It was still floating in the fluid, and still apparently 

 without any point of attachment to the exterior 

 portion of the nucleus. The lobes were much ex- 

 panded at the top, resembling individually the seg- 

 ments of an egg or pear bisected longitudinally, and 

 united by the small end. The additional cavity 

 observed on the eighth proves to be the section of 



5 



