A bud not wholly innocent of night,

And yet a color.

Cor. But see, it dies!

Perth. Yet now it blooms again,

Whiter, and with a rumor of hidden trumpets.

Buds in the common day do not usually bloom with a “rumor of hidden trumpets.” In the same scene Coronado asks:

Can you not see

The gem which is the mother of all dawn?

Perth. There is some gleam.

Cor. It waits one moment yet