PROLOGUE,  By David Garrick, Esq.   Enter MR. WOODWARD, dressed in black, and holding a handkerchief to his eyes.       Excuse me, sirs, I pray--I can't yet speak--      I'm crying now--and have been all the week.      "'Tis not alone this mourning suit," good masters:      "I've that within"--for which there are no plasters!      Pray, would you know the reason why I'm crying?      The Comic Muse, long sick, is now a-dying!      And if she goes, my tears will never stop;