Ferry Me Across the Water

"Ferry me across the water,
Do, boatman, do."
"If you've a penny in your purse
I'll ferry you."
"I have a penny in my purse,
And my eyes are blue;
So ferry me across the water,
Do, boatman, do."
"Step into my ferry-boat,
Be they black or blue,
And for the penny in your purse
I'll ferry you."