Sites 
upon my hand in the open air; as 
foon as it came out of the laft jar 
it feemed to grow worfe, and could 
ftand no more: however it re- 
covered gradually again. 
‘45- A {prig of pepper-mint was 
placed under an inverted jar upon 
a difh, with fome water upon it, to 
keep the plant alive, and to fhut off 
the communication with the. air in 
the jar, and the air without, It was 
placed in a warm day in a room 
againft the window towards the fan, 
from eleven till one o’ clock. Ans= 
other fprig of the fame plant, and 
of the fame fize, was put -under a 
fimilar jar, and®placed upon the 
floor far from the windows in ‘a 
room very well lighted, but in- 
which the fun did not fhine at that 
time. By examining both airs I 
found the air of the jar which was 
P 2 placed 
