The Frouirt-Garven I[dpfirated. 
51 
them to be 612: Then on a Piece of Paper I drew parallel Lines, 
at + of an Inch Diftance from each other, as the Lines aa, dc. Fig. VI. 
Plate 1. and alfo others at the fame parallel Diftance, at Right Angles 
to the former, as bb, @c. conftituting little Geometrical Squares, each 
containing ;2 Part of an Inch. 
THIS being done, I laid one of the Leaves thereon, and with a 
Black Lead Pencil traced about the Edges of the Leaf, and then numbering 
the little Squares within that traced Line, I found their Number to be 
116, which being divided by 16, gives {quare Inches 7 }. 
16)116(7 4 
, $4922 
4 remains, equal to 7, or 4. 
N. B. WHEN the Leaves of a Plant are of different Magnitudes, 
awbich generally happens, they muft be feparated into as many 
different Parcels ; and then meafuring the Surface of one im each 
Parcel, and knowing the Number of Leaves therein, may proceed 
as hes 
oF 144 .. wi Mrouble Conn the Le > (bec 
fpiration is perform’d as well by the under, as rhe t upper Part of the 
Leaf) and the Product will be the Area of all the Leaves. 
612 
tn 4 
bas gh Inches, the Area of the Leaves. 
HAVING thus obtain’d the Surface of the Leaves, whereat. their 
Moifture is perfpired away, I then proceeded to find the Surface of their 
Roots, where they imbibed and received it. For whatever ae the 
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