THE MORNING-GLORY AND THE ANT 
when its friends are abroad and unwelcome visitors who 
can render it no service are still asleep. 
There are other flowers that use this same principle in 
a different way. These are the night-blooming flowers. 
They come out when it is dark because the wingless in¬ 
sects are not then abroad to steal nectar. Neither are 
the bees abroad to carry pollen, for that matter. These 
night bloomers, however, do not depend on bees to bring 
them pollen, but on certain night moths. The night¬ 
blooming cereus is such a flower. Most of these night 
bloomers have very strong and sweet odors. This is given 
out to let the moths know that supper is being served. 
They come, are fed, and cause the plant to bear seeds. 
15 
