196 
Some of these cases were painted in the inside, of a red colour. 
They were all exposed to the same influence of the sun. 
The water which might evaporate from the sponges was prevented from 
escaping, so that, upon this ground, there could be no source of deception. 
But the germination proceeded much more rapidly in the darkened 
cages, than in those which were exposed to the influence of the light. 
SEVENTH EXPERIMENT. 
In other cases in a darkened chamber, where an increased heat could not 
have excited the germination, as in those exposed to the sun, here the germi¬ 
nation was even more rapid than in the other instances. 
CONCLUSION. 
Light therefore must be considered as unfavourable to germination. 
