Of Vegetation. 34 j 
Oaken board or fparula, a b c d of this fhape 
and fize, (Fig. 43.) thro’ the broad part at 
a quarter of an inch diftance from each other, 
I run the points of 25 pins xx which flood 
% inch thro’, and divided a fquare inch in- 
to 16 equal parts. 
With this inftrument in the proper fea- 
fon, when leaves were very young, I pricked 
feveral of them thro’ at once, with the points 
of all thefe pins, dipping them firft in the 
red lead, which made lading marks. 
(Fig. 44.) reprefents the fhape and fize of a 
young Fig-leaf, when firft marked with red 
points, \ inch diftance from each other. 
(Fig. 45.) reprefents the fame full grown 
leaf, and the numbers anfwer to the corrc- 
fponding numbers in the young leaf; 
Whereby may be feen how the feveral points 
of the growing leaf were feparated from 
each other, and in what proportion, viz. 
from a quarter of an inch, to about three 
quarter’s of an inch diftance. 
In this Experiment we may obferve that the 
growth and expanfion of the leaves is owing 
to the dilatation of the veficles in every part, 
as the growth of a young (hoot was fhewn 
to be owing to the fame caufe in the forego- 
ing Experiment ; and doubtlefs the cafe is the 
fame in all fruits. If 
