Versified Reply To An Invitation

Sir,

Yours this moment I unseal,
And faith I'm gay and hearty!
To tell the truth and shame the deil,
I am as fou as Bartie:
But Foorsday, sir, my promise leal,
Expect me o' your partie,
If on a beastie I can speel,
Or hurl in a cartie.

Yours,

Robert Burns.
Mauchlin, Monday night, 10 o'clock.