Of Vegetation. 34 j 



fize (Fig. 43.) ; through the broad part, at a 

 quarter of an inch diftance from each other, 

 I run the points of 25 pins x x y which flood 

 ^ inch thro', and divided a fquare inch into 

 16 equal parts. 



With this inftrument in the proper feafon, 

 when leaves were very young, I pricked feve- 

 ral of them thro' at once with the points of 

 all thefe pins, dipping them firft in the red- 

 lead, which made lafting marks. 



(Fig. 44.) reprefents the fhape and fize of 

 a young Fig-leaf, when firft marked with red 

 points, 4- inch diftance from each other. 



(Fig. 45.) reprefents the fame full-grown 

 leaf, and the numbers anfwer to the corre- 

 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 quarters of an inch 

 diftance. 



In this Experiment we may obferve, that 

 the growth and expaniion of the leaves is 

 owing to the dilatation of the veficles in every 

 part, as the growth of a young fhcot was 

 fhewn to be owing to the fame caufe in the 

 foregoing Experiment, and doubtlefs the cafe 

 is the fame in all fruits. 



If 



