

* 



Vegetable Staticks. 25 



for nine feveral mornings and evenings a 

 middle fized Cabbage plant, which grew in» 

 a garden pot, and was prepared with a leaden 

 cover as the Sunflower, Exper. \ft. Irs 

 greateft perfpiration in 12 hours day was 1 

 pound 9 ounces 5 its middle perfpiration 1 

 pound 3 ounces, = 32 cubick inches. Its 

 furface 2736 fquare inches, or 1 9 fquare feet. 

 Whence dividing the 32 cubick inches by 

 2736 fquare inches, it will be found that 

 a little more than the ^ of an inch depth 

 perfpires off its furface in 12 hours day. 



The area of the middle of the Cabbage 

 ftem is4f? of a fquare inch; hence the ve- 

 locity of the fap in the ftem, is to the ve- 

 locity of the perfpiring fap, on the furface 

 of the leaves, as 2736: iff. : : 4268 : 1 



for 



2736 X 156 

 100 



-4268. But if an allow- 





ance is to be made for the folid parts of the 

 ftem, (by which the paflage is narrowed) the 

 velocity will be proportionably increafed. 



The length of all its roots 470 feet, their 

 periphery at a medium T r T of an inch, hence 

 their area will be 256 fquare inches nearly j 

 which being fo fmall, in proportion to the 

 area of the leaves , the fap muft go with 



near 





