Vegetable Staticks. j 



I weighed this pot and plant morning 

 and evening, for fifteen feveral days, from 

 July 3. to Aug. 8. after which I cut off the 

 plant clofe to the leaden plate , and then 

 covered the ftump well with cement 5 and 

 upon weighing found there perfpired thro* 

 the unglazed porous pot two ounces every 

 twelve hours day, which being allowed in 

 the daily weighing of the plant and pot, I 

 found the greateft perfpiration of twelve 

 hours in a very warm dry day, to be one 

 pound fourteen ounces 5 the middle rate of 

 perfpiration one pound four ounces. The 

 perfpiration of a dry warm night, without 

 any fenfible dew, was about three ounces 5 

 but when any fenfible, tho* fmall dew, then 

 the perfpiration was nothing \ and when a 

 large dew, or fome little rain in the night, 

 the plant and pot was increafed in weight 

 two or three ounces. N. B. The weight si 

 made ufe of were Avoirdupoife weights. 



I cut off all the leaves of this plant, and 

 laid them in five feveral parcels, according 

 to their feveral fizes, and then meafured 

 the furface of a leaf of each parcel, by lay- 

 ing over it a large lattice made with threads, 

 in which the little fquares were £ of an inch 

 B 3 each 5 



