"But pleasures are like poppies spread;
You seize the flower—its bloom is shed;
Or like the snow-falls in the river,
A moment white, then gone for ever;
Or like the Borealis race,
That flit ere you can point their place;
Or like the rainbow's lovely form,
Evanishing amid the storm."
Long and short syllables alternately form the regular rhythm of this kind of verse; but occasional changes of rhythm and accentuation are used by all good writers. In the following lines Andrew Marvel introduces finely such a change:—
"He hangs in shades the orange bright,