4 V \ get able Stanch . 
CHAP. I. 
Experiments jjhewing the quantities imbibed 
and perfpired by Tlants and Trees . 
Experiment I. 
ULY 3. 1724. in order to find out the 
quantity imbibed and perfpired by the 
Sun-Flower, I took a garden-pot (Fig. 1.) 
with a large Sun-Flower, a, 3 feet -J- 4. high, 
which was purpofely planted in it when 
young; it was of the large annual kind. 
I covered the pot with a plate of thin 
milled lead, and cemented all the joints faft, 
fo as no vapour could pafs, but only air, thro* 
a fmali glafs tube d nine inches long, which 
was fixed purpofely near the ftem of the 
plant, to make a free communication with 
the outward air, and that under the leaden 
plate. 
I cemented alfo another fliort glafs tube 
g into the plate, two inches long and one 
inch in diameter. Thro" this tube I watered 
the plant, and then (lopped it up with a 
cork 1 I flopped up alfo the holes i , /, at the 
bottom of the pot with corks. 
I weighed 
