CHANGES SUCCEEDING IMPREGNATION. CHAP. VIII 



cord was now also very distinct, as well as the mark 

 which it had occasioned on the surface of the kernel. 



SUBSECTION V. 



General Remarks. In the above examples the 

 process of the developement of the vegetable em- 

 bryo will be found to be analogous to that of the 

 developement of the animal embryo, according to 

 the observation of Malpighi and Gaertner. In 

 tracing the progress by means of the repeated in- 

 spection of the ovary, the chorion is found to be 

 first developed ; then the umbilicus pervading the 

 centre of the chorion, and expanding at the ex- 

 tremity into the sacculus colliquamcnti; then the 

 amnios, which after being elaborated in the chorion, 

 is conveyed by the umbilicus to the sacculus ; and 

 lastly the embryo, occupying the upper region of 

 the amnios at first a mere point incapable of being 

 distinguished into its several parts, but by and by 

 exhibiting the rudiments of root, stem, and leaf, 

 together with its cotyledons or seed-lobes, between 

 which the amnios penetrates, and hence reaches the 

 embryo. 



Malpighi is of opinion, however, that the amnios 

 is augmented and the embryo nourished, not merely 

 by means of the nutriment that passes through the 

 umbilicus ; but also by means of the juice of the 

 chorion which penetrates through the sacculus col- 

 liquamenti and so reaches the embryo ; because in 



8 



