195 
( 
FOURTH EXPERIMENT. 
In a fourth, the apparatus was put in the room, in the shade. 
FIFTH EXPERIMENT. 
In a fifth, wholly excluded from the light. 
RESULT. 
In twenty-four hours some grains had already begun to push out the 
radicle, in the third, fourth, and fifth experiments. 
In forty-eight hours the radicles appeared in the second apparatus. 
On the third day, all had radical leaves, except the first. 
On the fourth day, the radicle in the first appeared in a few seeds only; 
all the others were destroyed. 
In experiment first, exposed to the full action of the sun the seeds might 
seem to have suffered from a too great degree of heat; but the seeds in the 
third apparatus had undergone a greater degree of heat; for the first shewed 
82 degrees of heat, the second was at 86 , and the third at Q2 degrees. 
They each advanced exactly in proportion to the exclusion of light. 
These experiments were so often repeated, and always with the same result, 
that there no longer remains any ground for doubt. 
The abbe Bertholon suspected, that the quicker vegetation of seeds arose 
from the quantity of water being greater in the one case than the other. 
Senebier, to determine this point, made the following experiment. 
SIXTH EXPERIMENT. 
He placed pease, beans, and french beans, upon sponges, which had im¬ 
bibed an equal degree of water, inclosed in tin vessels of a determinate size, 
covered with cemented glass. 
