What Makes Echo Rebound

1

Rebounds resisting substance must work on,2
Both in itself, and what it beats upon,3
For yielding bodies which do bow or break
Can ne’er rebound, nor like an4 echo speak.
Then every word of aïr forms5 a ball,                                      5
And every letter like a ball doth fall.
Words are condensèd air, which heard, do grow
As water which by cold doth turn to snow.
And as when snow is pressed hard balls become,6
So words being pressed as balls do backward run.7           10