Vegetable Staticks. 5 



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 Hump well with cement ; 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 -, the middle rate of 

 perfpiration one pound four ounces. The 

 perfpiration of a dry warm night, without 

 any fenfible dew, was about three ounces ; 

 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. TM. B. The weights 

 I 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; 



