Vegetable Staticks. \ 5 



middle- fized Cabbage plants which grew in 

 a garden pot, and was prepared with a leaden 

 cover, as the Sun-flower, Exper. \Jt % Its 

 greatefl perfpiration in twelve hours day 

 was 1 pound 9 ounces; its middle perfpira- 

 tion 1 pound 3 ounces, = 32.7 cubick inches. 

 Its furface 2736 fquare inches, or 19 fquare 

 feet. Whence dividing the 32 cubick inches 

 by 2736 fquare inches, it will be found 

 that a little more than the-g^ of an inch 

 depth perfpires off its furface in twelve hours 

 day. 



The area of the middle of the Cabbage 

 flem is -fy£ of a fquare inch ; hence the ve- 

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

 locity of the perfpiring fap on the furface 

 of the leaves, as 2736 : f§g : : 4268 : 1 . 



for 2 J 3 6x ^ 6 = 42 63. But if an allow- 



100 T 



ance is to be made for the folid parts of the 

 flem, ( 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 of an inch, hence 

 their area will be 256 fquare inches nearly; 

 which being lb fmall in proportion to the 

 area of the leaves, the fap muft go with 



above 



