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15. §. That of Black Poplar, by Three; and each Edge by Three 
_ repeated. Onthe left, the Diameter of the Firft, is the Length of the 
Tab. 45. Leaf of the Second, Half thelength; of the Third, the Length and 
Half. The Meafure of the right Edge, is that of the left, Inverted < 
the fame AMeafure there beginning at the Ba/é, and ending at the Coxe 5 
which here begins at the Cove, and ends at the Ba/e. 
16. §. That of Doronicum, is meafured by Three Circles, whereof, 
one isrepeated Once; and another Thrice. The right Edge by Two, 
and One repeated. For the Diameter of the Firft or that next the Cones 
is the Length of the Leaf’; the next is the fame, but drawn Outward; 
Tab. 45. the Diameter of the Third, is Half the Length. The left Edge, by 
Three Circles; whereof One is repeated on the fame Edge, and Two, 
the fame, as onthe other. For the Diameter of the firft, is the Length 
of the Leaf’; of the Second, Four times the Length 5 the Third, the 
fame as the Firft; and of the Fourth, Half the Length. 
17. §. Laftly, that of Mountain Calamint is meafared by Four 
Tab, 45. Circles. The left Edge, by Three Circles, of which, the lowermoft is 
‘ once repeated: the right Edge alfo by Two; whereof the nether is 
likewife once repeated. : 
18. §. Itmay feem, even from thefe Inftances, no very unobvious 
Conclufion 5 That all Crooked Lines, Spiral, Helick , Elliptich , Fyperbo- 
lick, Regular, or Irregular 5 are made up of the Arches of Circles, having 
either the fame, or divers Centers and Diameters. And, as otherwife, 
fo from the Contemplation of Plants, men might firft be invited to azz. 
thematical Enquirys. : 
19. § TOGETHER with the Figure of the Leaf, the Pofition 
of the Fibers, as it is apparent before Diffection, is obfervable ; efpeci- 
ally onthe back of the Leaf: Whereof I fhall add, to what I have 
faid inthe Firff Wook, the following Remarques. 
20. §. Firft, that there are fome Leaves, in which the firft Colla- 
teral Fzbres make Right Angles with the Great one in the midle: as 
the Great-Maple, the Great Celandine, Chondrilla, and the reft, or many, 
of the Iztybous Kind 5 with fome few others. But that generally all the 
chief Fibers of a Leaf, make Accute Angles together: both where they 
{tand collateral with the midle Feber, as in Strawberry ; and where they 
all part at the Sta/k, as in Mallow. 
21. §. Again, a of thefé, there are fome few, any two of whofe 
Defining Fibres making two Rays of equal Length, take in One Eighth 
Tah 46, o Part of 5 Circle, as in Mallow fi and ia fome ee Tenth: but in eolt 
ae they take in either one Twelfth part, as in Holy-Oaks or one Sixth, as 
in Stryzga. So that where the Fibres ftand Collateral with one in the 
the midle, if you fuppofe them to be drawn out at Oppofite Angles 5 
or where the chief F7bers part at the Stalk, you only take in the stalk 5 
you will thereby divide a Circle into Eight, Twelve, or Six equal Parts; 
asin Sirynga, the Vive and others. And fo likewife, where there are 
Tab.46,47, feveral Sprigs upon one Stem, asin Fenil, Hemlock, and the like: 
: as will beft be underftood by the Figures. 

CHAP. 

