SRS SSeS 
on the Vegetation of Seeds. 501 
The infant fprout at firft fuffers only a fuf- 
penfion of its energy from the abfence of pure 
air; but if this neceflary fupport be withheld 
too long, it perifhes by the putrefactive fermen- 
tation: For if feeds treated as in Experiment 
XIV. be taken out of the azgofe in which they 
are confined, at the end of two or three days, 
‘they begin to vegetate afrefh with unimpaired 
vigour; but if their ftay in the gas be protracted 
_ three or four days longer, when the weather is 
moderately warm, they lofe their natural color, 
and putrify. 
Experiment XVI. The lively green, which 
the ftems and leaves of plants receive from the 
action of light, cannot be imparted to them, 
provided the energy of the vegetative principle 
in them be fufpended: for after permitting a 
‘number of peas to produce both extremities of 
their fprouts in wet fand covered from the light 
by an earthen pot, 1 placed five of them, on 
the twenty-ninth of April, in an inverted glafs 
jar, containing azote confined by water; and 
three in another jar, in which a portion of 
common air was alfo inclofed by the fame means. 
‘On the thirtieth, the upper extremities of the 
{prouts of the parcel laft mentioned were green ; 
but, though the Experiment was prolonged to 
the fecond of May, thofe in the other glafs did 
pot exhibit any perceptible alteration in fize or 
color. 
