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These two parts have been styled in the language of Botany corculum , 
the heart of the seed. 
The projecting part, or rostellum, when it shoots into the ground in its 
first growth is then called the radicle , from the Latin Radioula, a small 
root, being destined to become the root. 
The other projecting part, as it mounts in air, is called the plume 
(Plumula), from its bearing some resemblance to a feather, the Latin for 
which is Plum a. 
The bean itself naturally divides into two lobed (Lobuli), convex ex¬ 
teriorly, and concave internally, which are joined together in a dove-tail 
manner. 
If you examine the surface of these lobes, there will not be found the 
smallest inequality, all is smooth and glossy, whereas the finest polish of 
human ingenuity is extremely rough. 
Only view the best wrought needle, it presents to your eye nothing but 
huge inequalities, whereas the works of the Almighty ever manifest the most 
astonishing perfection. 
By making a transverse section along the lobes, there will be seen on the 
surface Amall veoAelo interspersed among the blebs, which, even to the naked 
eye, has a greener appearance than the other parts. 
These were rendered very visible by Bonnet, who immersed the lobes 
in ink, and a transverse section being made, they appeared like so many 
black dots. 
This organization, however, is better shewn by a longitudinal section of 
one of the lobes, when the ligneous veAAelo will be observed to pass in a regu¬ 
lar direction, all terminating towards the plume , which is affixed to each lobe, 
lying under the two Ahozildero, or projections of the bean, above which was 
situate the hilum, or eye of the bean. 
We now are able to comprehend how excellently the arillus is contrived 
for the protection, and containing of the seeds. 
The arilluA , viewed internally, has two cavities for the reception of the 
two shoulder a of the bean just before explained; and under these, exactly in 
the centre, is another and deeper cavity for the reception of the roAtellum ; 
and, if we return from surveying the internal structure to the external, we 
shall readily perceive, that that part of the arillus which corresponds to the 
