COMPLETE TITLE: Theatralia, No. I. On Garrick and Acting; and the Plays of Shakespeare, considered with Reference tor their Fitness for Stage Representation.
Online text (two volume edition of The Reflector, II, 298-313): INTERNET ARCHIVE - GOOGLE BOOKS

Along with Imperfect Dramatic Illusion (see) this is Lamb's most important contribution to the theory of acting.

LATER EDITIONS:
Republished in 1818 by Lamb with the new title On the Tragedies of Shakespeare, considered with Reference tor their Fitness for Stage Representation (see) in The Works of Charles Lamb in Two Volumes (London, C. and J. Ollier, 1818, v. II, pp. 1-36).
Online text: GOOGLE BOOKS

The essay was reprinted in many editions of Lamb's work and is included, along with Lamb's other writings on theatre in:
- The Prose Works of Charles Lamb, London, Edward Moxon, 1836, vol. I, pp. 99-132.
Online text: INTERNET ARCHIVE
- The Art of the Stage as set out in Lamb's Dramatic Essays, with a Commentary by Percy Fitzgerald, M.A., F.S.A., London, Remington and Co., 1885, pp. 1-29.
Online text: INTERNET ARCHIVE - HATHI TRUST

Reprinted in the collective work Victorian Dramatic Criticism, ed. by George Rowell, London, Methuen, 1971, pp. 22-34.

TRANSLATIONS:
Sulle tragedie di Shakespeare considerate dal punto di vista della loro possibilità di essere rappresentate, in Gabriele Baldini (ed. by), La Fortuna di Shakespeare (1593-1964), 2 vols., Milano, Il Saggiatore, 1965, volume I, pp. 216-237 (see). Translation by Giorgio Melchiori.