This is my letter to the world That never wrote to me The simple news that Nature told With tender majesty Her message is committed To hands I cannot see; F...

This is my letter to the world
That never wrote to me
The simple news that Nature told
With tender majesty

Her message is committed
To hands I cannot see;
For love of her, sweet countrymen
Judge tenderly of me'

To whom does 'her' in line 5 refer?