8 Vegetable Stattcks. 



The velocities, in the furface of the leaves, 

 roots, and tranfverfe cut of the ftem, are 

 gained by a reciprocal proportion of the 

 furfaces. 



^ ^leaves =5616 

 g >roots = 2276 

 < Sftem = 1 



> 



rh' mch 

 ^j inch 



34 inch. 



Now, their perfpiring 34 cubicle inches in 

 twelve hours day, there mud: fo much pafs 

 thro* the ftem in that time; and the velo- 

 city would be at the rate of 34 inches in 

 twelve hours, if the ftem were quite hollow. 



In order therefore to find out the quan- 

 tity of folid matter in the ftem, July 2jth at 

 7. a. m. I cut up even with the ground a 

 Sun-flower ; it weighed 3 pounds ; in thirty 

 days it was very dry, and had wafted in all 

 2 pounds 4 ounces ; that is f of its whole 

 weight: So here is a fourth part left for 

 folid parts in the ftem, (by throwing a piece 

 of green Sun-flower ftem into water, I found 

 it very near of the fame fpecifick gravity 

 with water ) which filling up fo much of the 

 ftem, the velocity of the fap muft be increaf- 

 ed proportionably, viz. f part more, (by 



reafon 



