Vegetable Statkks. tf 



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* xft. Its 

 greateftperfpiration 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 is t-M- of a fquare inchj 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: if§. : : 4268 : 1 



f or fZH2UH = 4268. But if an allow- 

 100 



ance is to be made for the folid parts of the 



ftem, (by which the paffage is narrowed) the 



velocity will be proportionably increafed. 



The length of all its roots 470 feet, their 



periphery at a medium T V of an inch, hence 



their area will be 256 fquare inches nearly 5 



which being fo fmall, in proportion to the 



area of the leaves ? the fap muft go with 



near 



