132 THE HUMAN SIDE OF PLANTS 
do they respond to light, but they give every other 
evidence of the use of their eyes in their work. 
The eyes of plants are of two distinct kinds; one 
kind, the less complex, are made by smooth epider- 
mis, and the cells have a plain outer covering. 
These are very similar to a glass window which al- 
lows the sun’s rays to pass through, and fall on the 
objects within a room, but in no way aids in con- 
centrating the rays of light in definite places. The 
other kind of eyes are formed of papillose epider- 
mis, whose outer and inner surfaces are so made 
as to produce plano-convex lenses. These readily 
concentrate the rays of light over a definite area, 
and in this respect are very similar to human eyes. 
In the study of light-producing plant types, as 
in the understanding of all types and classes of 
plants, the average botanist has but knocked at the 
outer door; while before him is a labyrinth of many 
doors and many barriers. Apparently the secret 
passage to the centre of this maze, to the heart of 
the flowers, lies in the attuning of the human na- 
ture to the nature of the plants. Science tells us 
much, but without an absolute communion, a thor- 
ough accord and responsive affinity between human 
soul and plant soul there never can be a thorough 
understanding of the nature of the plants. 
