ye LIFE OF A TREE. 
were so prepared, that air was freely admitted 
to the plants within them, without permitting 
the passage of any light except that which passed 
through the coloured glasses with which they 
were covered. These glasses were of the following 
colours: a ruby, a brown-red, an orange, a yellow, 
a cobalt-blue, and a deep-green. ‘The young plant 
first broke the soil in the box covered with 
orange-glass, and last under those covered by 
yellow, green and blue glasses. It was subse- 
quently found that the effect of the yellow rays 
was such as to prevent the germination of. the 
seed, even although the rays only rested on the 
surface of the soil, while the seed lay buried 
beneath; and, again, that the blue light seemed 
remarkably to favour this process. Under the 
orange light the plants grew very tall, but had 
white stalks, and refused to put forth any flowers. 
Under the yellow light, it was remarkable that 
a number of little fungi, or moulds sprang up 
and flourished luxuriantly, while the plants them- 
selves withered and died. Under the red light 
the plants only grew an inch or two high, had 
something of a reddish colour, and soon rotted 
and perished, although supplied with abundance 
