ESS 
‘Sie 
on the Vegetation of Seeds. 499 
permitted to fprout in wet fand, contained in 
another pot covered witha lid to exclude the 
light; and the rudiments of their roots, which 
appear firft, were at that time from one inch to 
one inch and a half long, being undivided and of 
a conical figure. In this fituation they remain- 
ed till the fourteenth, in a window looking to the 
the Eaft, without making a vifible progrefs in 
growth: they were therefore taken out of the 
jar, and the longeft fprout, being compared with 
a meafure to which it exactly correfponded on 
the eighth, was found not to have altered in the 
leaft. An equal number of peas, in the fame 
ftate, were placed under a jar containing com- 
mon air, ftanding in the fame window at the 
beginning of the Experiment. In thefe, vege- 
tation made a vifible progrefs; for the upper 
extremity of the f{prout appeared in moft of 
them on the twelfth, which foon affumed a 
green colour, from the aétion of light: But 
though the experiment was prolonged to the 
twenty-fecond, in which time the roots attained 
the length of four inches at leaft and became 
branched, they ftill preferved their primitive 
whitenefs. The fame experiment was repeated 
between the twenty-fecond and twenty-eighth 
of the fame month, with two parcels of fprout- 
ed’ beans; and the refult correfponded exactly 
to the facts that have now been ftated. 
Qqq2 Experi- 
