to Vegetable Statich. 



hours day, was 1 1 ounces, its middle quan- 

 tity 9 ounces, or 1 5 i cubick inches. 



The 1 5 f cubick inches perfpired, divid- 

 ed by the furface 1589 fquare inches, gives 

 the depth perfpired offthe furface in 1 2 hours 

 day, viz. rf? of an inch. 



The area of a tranfverfecut of itsftem,4of 

 an inch fquare, whence the fap's velocity 

 here, will be to its velocity on the furface 

 of the leaves as 1589 X 4= 6356 : i s 



Experiment V. 



Prom July 28. to Aug. 25. I weighed for 

 10 feveral mornings and evenings a very 

 thriving Li won- tree, which grew in a gar- 

 den pot, and was covered as above: Its great- 

 eft perfpiration in 12 hours day was 8 ounces, 

 its middle perfpiration 6 ounces, equal to 

 io| cubick inches. In the night it perfpired 

 fometimes half an ounce , fometimes no- 

 thing, and fometimes increafed 1 or 2 oun- 

 ces in weight, by large dew or rain. 



The furface of its leaves was 2557 

 fquare inches, or 17 fquare feet -f- 59 

 fquare inches j dividing then the iof cubick 

 inches perfpired by this furface, gives the 



4 depth 



