Yet, if the essay admits more properly than biography or fiction of sudden boldness and metaphor, and can be polished till every atom of its surface shines, there are dangers in that too. We are soon in sight of ornament. Soon the current, which is the life-blood of literature, runs slow; and instead of sparkling and flashing or moving with a quieter impulse which has a deeper excitement, words coagulate together in frozen sprays which, like the grapes on a Christmas-tree, glitter for a single night, but are dusty and garish the day after. The temptation to decorate is great where the theme may be of the slightest. What is there to interest another in the fact that one has enjoyed a walking tour, or has amused oneself by rambling down Cheapside and looking at the turtles in Mr. Sweeting's shop window?