Iv ON PLANT LIFE 137 
come out in the evening, are often very sweetly 
scented, and are generally white or pale 
yellow, these colours being most visible in the 
twilight. 
Aristotle long ago noticed the curious fact 
that in each journey Bees confine themselves 
to some particular flower. This is an economy 
of labour to the Bee, because she has not to 
vary her course of proceeding. It is also an 
advantage to the plants, because the pollen 
is carried from each flower to another of the 
same species, and is therefore less likely to be 
wasted. 
FRUITS AND SEEDS 
After the flower comes the seed, often 
contained in a fruit, and which itself en- 
closes the future plant. Fruits and seeds 
are adapted for dispersion, beautifully and in 
various ways: some by the wind, being either 
provided with a wing, as in the fruits of many 
trees — Sycamores, Ash, Elms, ete.; or with 
a hairy crown or covering, as with Thistles, 
Dandelions, Willows, Cotton plant, ete. 
