on the Vegetation of Seeds.” 503 
fomething which is natural to the ftem, and 
its appendages. Hence we perceive, that though 
a perennial may by accident become an annual, 
the contrary cannot poflibly take place. In the 
courfe of May I repeated the laft experiment 
with Beans; and the event of this trial corre- 
fponded exacily to what has been already faid 
on the fubje&. Hence it may be fafely in- 
ferred, that greenne/s cannot be imparted to the 
Aprouts of feeds without the joint action of Light 
and oxygene; in which they are very different 
from the fhoots that frequently proceed from 
maturer plants, when fecluded from the atmo- 
fphere: for, as thefe grow freely in clofe glafs 
veffels, placed in a window, and containing 
water and azote, the parts which are recently 
produced continue to vegetate, in confequence 
of their connection with the parent ftock, and 
acquire the color in’ queftion without’the amit 
ance of ref{pirable air, as is evident from the 
following article: 
_Experrment XVII. On the fecond of July, 
I introduced a flip of Spear-mint into a fix- 
ounce-phial, in fuch a dire€tion that the end 
of its ftalk remained in the neck. '’'The bottle 
was then filled with river water ; and, being in- 
verted in a veffel of the fame, about four ounces 
of the water were difplaced by azote: after 
which the.mouth was ftopped with a cork in 
the 
