I 12 
VEGETABLE STRUCTURE. 
All this is tranfadled in the body of the Seed, which is yet entire. But 
when the brown Coat is capable of no more diflention, it burfts ufually 
at the bottom, that is, tlie part oppofite the fear ; and gives way to the 
fwelling Embryo to fpread. A Seed perfedt, and fit for fowing, is figured 
at 38: and at 39, one burfl:, and letting out the embryo Plant. 
The browm Skin, which is now of no more ufe, may be eafily taken 
offj and we then fee the naked embryo, 40, confifting of a conic white 
part, and a rounded, but flatted body, compofed of two doubled Plates, 
between which, tho’ on one fide, runs the conic part. 
This little Cone is the original annular Embryo of the Farina, now 
confiderably lengthened, but no other way altered ; and covered with its 
Coats. The broad flakes are the matter of the body of the Seed, now 
formed into the rudiments of feminal Leaves 3 and tho’ they had appeared 
to be four, we find in this advanced flate that they are but two. They 
are not feparate at the edge oppofite to the little cone, but only folded for 
the convenience of being contained in that fhell. 
We now find, that thefe two parts, the Cone, and the pair of Leaves, 
make up the whole body of the Seed ; and this confirms what was before 
laid of their origin; that the original of the Embryo of the Farina plainly 
begins its growth in the growing Seed ; that the Juices fent thither ferve 
only for its nourifliment, and that thofe two folded Plates, and its Crown 
between them, are its firfl: growth ; which flops only becaufe no more 
Juices are fent thither. In fome fpecies the Embryo grows more, in fome 
lefs, in the Seed ; but that is all the difference. 
After the brown Shell of the Seed is fallen off, and the young Plant 
is loofe, the Progrefs in growth is very quick. The Cone, 40, a, length- 
ens, and becomes a Root ; and the two folded Plates enlarge, and fepa- 
rate at their edges, and begin to fi read afunder. We perceive very dif- 
tinflly, that the back of e >ch is entire, and we fee one rifing above the 
other, as at 41. Thus that part of the Embryo which has extended it- 
felf downwards for a Root, acquires its proper form, and is committed na- 
ked to the earth ; from which its fpungy fubftance attradls nourilhment : 
but the convoluted head, which is the firfl rudiment of the Stalk, is flill 
dole covered by thefe two Plates, and is a mere dot, making no advance 
toward extenfion. 
All this is tranfidted within the earth therefore the parts have not their 
proper colour ; thefe two folded Plates, which are prefently to become 
what we call feminal Leaves, are yet yellow. This may be called the 
FOURTH flate of the Plant. 
Hitherto 
