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. 



FKUITS 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, etc. ; or with 

 a hairy crown or covering, as with Thistles, 

 Dandelions, Willows, Cotton plant, etc. 



