124 
VEGETABLE STRUCTURE. 
which bears the*Bud ; and by tracing their firfl: formation and growth, we 
fliall be led to the fyftem of increafe in the whole Plant. 
]n the abfoliite hate of the Biiding there rife two Leaves from the furface 
of that fliort rudiment of a Stalk ; the one a little higher on it than the 
ether. Thefe are defences of the Bud ; and when in the ftate of growth, 
they fpread out from it, as in the Figures 59, 60, 61. Two others rife 
within their bafes, or between them and the Bud in the fame manner. 
Thus are gradually produced, and thus are enlarged, all the Radical Leaves ; 
a confiderable number of which are produced before the firfl riling of the 
Bud toward a Stalk. 
We are to examine by what means they are formed, and of what parts 
they are compofed ; and this will be bed traced by the lielp of Glaffes, in 
this very minute date : tho’ it may be very happily illudrated afterwards, 
by what the naked eye fees of them at their full growth. 
At the point*, which is the part where the Root terminates and the 
Bud rifes, the two Rinds and the Blea go off to the Seed-Leaves ; yet are 
not the Bud or the rudiment of a Stalk on which it dands, deditute of 
the fame fubdances ; for thefe are all formed regularly and eafily wherever 
there is the lead Fledi of the Plant. 
The origin of the Radical Leaves is like that of the Seed-Leaves, from 
a part of the Coats and other fubdances riling obliquely outwards from the 
rudiment of a Stalk, at the fame time that a portion of the fame parts covers 
alfo the furface of that rudiment. This will be underdood eafily by the 
origination and condrudion of one of thefe Radical Leaves, examined by 
the Microfeope ; for, indeed, it is one and the fame fubdance of each coat 
which covers the rudiment of the Stalk, and the Radical Leaf: that is, 
the whole Leaf is formed by the growth of parts from that rudiment, and 
its Membranes are only expanlions of the coats of that part. 
The Radical Leaf, in this Plant, conlids of two Membranes, a Blea, 
and three original conic cluders of Vdfels, which foon divide into more, 
and which rife covered with a thin coat of the Fledi of the Plant. Their 
origination is this. 
As foon as the Seed-Leaves are expanded to the air, the vad quantity 
of moidure they receive from thence occafions the Root to grow, and fills 
the rudiment of the Stalk with nouridiment. The fird effort of this is on 
the Flelh of that rudiment j and from one fide of it, near the head of the 
Root, there rifes a little procefs from the furface of the Fledi, which points 
obliquely upwards : immediately a fmaller Blider is formed on each fide of 
the fird 3 and thefe pulhing in the fame diredlion, raife the Blea, and the 
two 
