one position, as the slightest manifestation of weakness

To grow all hollow with a thickened crust

Surrounding; for thereafter, when the force

And the keen onset of the wind have weakened

That crust, lo, then the cloud, to-split in twain,

Gives forth a hideous crash with bang and boom.

No marvel this; since oft a bladder small,

Filled up with air, will, when of sudden burst,

Why clouds make sounds, as through them blow the winds: