Vegetable Statlch. 



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9 



reafon of the reciprocal proportion) that 34. 

 cubick inches may pafs the ftcm in twelve 

 hours 5 whence its velocity in the ftem will be 

 45-f inches in twelve hours, fuppofmg there 

 be no circulation nor return of the lap 

 downwards. 



If there be added to 34, (which is the leaft 

 velocity) f of it = 1 ij, this gives the greateft 

 velocity, m. 45f. The fpaces being as 3 : 

 4. the velocities will be 4:3 :: 45^: 34. 



But if we fuppofe the pores in the fur- 

 face of the leaves to bear the fame propor- 

 tion, as the area of the fap vefTels in the 

 ftem do to the area of the ftem j then the 

 velocity, both in the leaves, root and ftem, 

 will be increafed in the fame proportion. 



A pretty exacV account having been ta- 

 ken, of the weight, ftze, and furface of this 

 plant, and of the quantities it has imbibed 

 and perfpired, it may not be improper here, 

 to enter into a comparifon, of what is taken 



in and perfpired by a human body, and this 

 plant. 



The weight of a well ftzed man is 160 

 pound : The weight of the Sunflower is 

 three pounds, fo their weights are to each 

 other as 160 



3, or as 53 



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The 



