VEGETABLE STRUCTURE. 
lOl 
of thefe, where they pierce the Fledi, arife new Conic Clufters, which do 
not form returning fyftems, but fpread themlelves thro’ the fubftance of 
the Seed in the rudiments of the Seed-Leaves. Thefe have been taken for 
a peculiar fyftem of Roots. 
The inner fubftances being thus formed, and (lill redundant Juice fup- 
plied to the Plantu'.c, its cxtravafated Juices fiift form the Val'cular Series. 
Tirere remains fome of the waxy matter of the Anthera among the proper 
Juices cf the Flelh-Veffels j and this being mod unlike the red, is hi ft 
thrown out : it is puOied forth with fome violence ; it continues to follow 
the courfe of the Mantule, and conforming itfelf to its flaape, and the fe- 
veral ftreams hardening at the furface, the Vafcular feries is formed : the 
two Membranes being only extenfions of the fubdance of the Coats of 
thefe Veflels, reaching from one to the other, and keeping all together. 
The waxy fluid being feparated, the next which is cxtravafated forms 
in the fame manner the Veflels of the Blea ; and the extravafations from 
thefe give origin to the Veftels of the two Rinds. Thus is there lodged 
within the body of the Seed, a piece of the eflential fubdance, or Flefh 
of the original Plant, which has there formed for itfelf, by the natural 
courfe of the Juices, all its coverings. The purpofe of Nature being fo 
far anfwered, in the common ftate of things, no more is done there. The 
Juices of the Stalk ceafe to flow into the Seed-Veffel, the Seeds harden, 
and they are fit for fowing. Every one containing a perfedl portion of all 
the fubftances of the future Plant, needs only due warmth, and that moif- 
ture it no longer receives from the Seed, to continue growing. 
Thus far all Vegetable Nature, fo far as I have examined, is regular; 
the formation of the Plantule in the globule of Farina, being alike in all : 
but it is not fj in the fucceeding periods, for Seeds differ in the condruc- 
tion and arrangement of that pulpy matter in which the Plant is lodged ; 
and, therefore, while the generality rife with two Seed-Leaves, as the 
Turnip, fome have only one, as the Corn and Grafs kinds; and others' 
have feveral, as the Pine. Therefore it will be neceffary, in tracing the 
Seed to the Plant, to fix upon one inftance, and the more common the 
Plant be the better. I have chofen the Radifh, becaufe its Seed is always 
at hand, becaufe it very readily grows, and becaufe the parts of -the. entire 
Plant are large and confpicuous. 
To trace the whole progrefs of Vegetation, I (hall take this inftance ; 
in which, howfoever minute the refearches may appear, it will be eafy for 
every one to follow them : and, to leave no part unconfidered, it will be 
beft firft to confider the Plant perfedl, and in flower; to trace the forma- 
tion 
