Vegetable Staticks . 5 3 
night, and more than a double quantity of 
Dew falls on a furface of water, than there 
does on an equal furface of moift earth. 
The evaporation of a furface of water in 
9 hours winter's dry day is of an inch. 
The evaporation of a furface of ice, fet in 
the fliade during 9 hours day, was T V. 
Thefe Pans increafed in weight by the 
night's Dew 180 grains ; and decreafed in 
weight by the evaporation of the day 
1 ounce, 28 2 grains. So here are 540 
grains more evaporated from the earth every 
24 hours in fummer, than falls in Dew in 
the night 5 that is, in 21 days near 2 6 ounces, 
from a circular area of a foot diameters 
and circles being as the fquares of their dia- 
meters, 10 pounds -j- 2 ounces will in 21 
days be evaporated from the hemifphere of 
30 inches diameter, which the Sunflower's 
root occupies : Which with the 29 pounds 
drawn off by the Plant in the fame time, 
makes 3 9 pounds, that is, 9 pounds and J. 
out of every cubick foot of earth, the 
Plant’s roots occupying more than 4 cubick 
feet s but this is a much greater degree of 
drynefs than the furface of the earth ever 
fuffers for 1 5 inches depth, even in the dry- 
eft feafons in this country. 
E 3. In 
