BookIV. of Leaves. 1 57 f 
Bell, and fome others; the Under-Lezves, which differ in Shape from 
the reft, are all at firft formed in the Plume, before it begins to /pronts 
and the reft afterwards; That is tofay, that the former Leaves, are all 
formed (out of Sap from the Truk ) with the Seed it felf, and fo 
compofé one Principal Part thereof, fè. the Plume: the latter, not till 
after the Seed is fow'n, and fo the Plume fapply'd with Sap imme- 
diately from the Root. Which Sap, it feems, is fo far different from 
the former, as fometimes to produce a different Sort of Leaves. 
5. $ SECONDLY, ofthe Buds of all Trees, and of Perenni- 
Stalks, it appears, That they confift of a great number of Leaves, all 
perfectly formed tothe Centre ; where,notwithftanding,they are fome- 
times, not half fo big as a Cheefe-Mite. So that all the Leaves which 
ftand upon a Branch or Cien of one whole Years Growth, were a@u- 
ally exiftent in the Bud. It isalfo very obfervable, That although 
thefe Buds begin to be expanded not till Spring, yet are they entirely 
Formed, as to all their Integral Parts, in the Autumn foregoing. So 
that the whole Stock of Leaves which grow upon a Tree, or any Per- 
ennial Stalk, this year; were made, or actually in being, the laft 
year. A greater Heat, more fubtilized Aer, and better concotted 
t Juyce, being requifite for their Generation, than for their bare Expan- 
mir die fion and Growth, 
e malt ei: 6. $. LASTLY, ofall Aval Plants, in which there are fe- 
veral Succeflive Generations of Buds, one under another in one year; 
although I have not made the Remarque, yet amapt to believe, That 
as the Leaves in every Bud are all formed together, as in other Plants + 
fo likewife,that the Succeffive Generations of the Under-Buds, begin at 
certain ftated Terms + as in fome Plants, at every New Moon ; in others, 
ius at the Full Moon; and in fome perhaps; with both, or every 
f their Fourt’night, 
ent which CHAT. VL 
ork nd Bu 
Spat Of the Manner of the Generation of the Leaf. Where 
Pr da alfo; that of the Two General Parts of a Plant, fc. the 
ar Lignous and Parenchymous, is further explain d. 
, either 4 . 
AR HE Vifible Canfes of the Figures of Leaves, have Bu. Ch. ds 
pe 7 N been formerly mentioned. It may here be # 
poy 4 further noted, That the greater Fibers of the 7 
sg Leaf, bei Bra Se 
d eaf, eing never Braced in the Stalk; itis a 
ae good preparative for their better fpreading in 
fer oe the Leaf: As alfo, that the fame is much favourd, 
: by the extream (malneß of the Aer-Vefféls here- 
es | \ er fily divaricated,i 
n 1 IE S25.2 in: whereby they are more ea aly divaricated,in 
rie ATA the leffer Fibers,and fo the Leaf dilated. 
io 2. $. BUT thee and the like are to be reckoned a fecondary Or- 
Wa der of Canfes 3 which ferve rather to carry on and improve,that which 
j r Nature hath once begun. And therefore, we muft not only confider Idea, 5.53. 
f ¡at the vifible Mechanifm of the Parts ; but alfo the Principles o£ which = 
ws a: compofed; wherewith, Nature feems to draw her firit 
trokes. 
Fi : 3.9 
