Classic Poem

In these Seven Languages I this my Book do own,
Friend, if thou find it, Send the same to Germantown;
Thy Recompense shall be the half of half a Crown:
But, tho' it be no more than half the half of this,
Pray! Be Content therewith, & think it not amiss.
Yea and if, when thou com'st, my Cash perhaps is gone,
(For Money is thus scarce, that often I have none)
A Cup of Drink may do: Or else, alas! thou must
Trust unto me a while, As I to Others Trust,
Who failing make me fail: A thing extreme unjust!
To which I have no lust; But must per Force, poor Dust.