In 1760 appeared his Prolusions, or, Select Pieces of Ancient Poetry, a collection which included Edward III, placed by Capell among the doubtful plays of Shakespeare.
[2] Capell published the first part of his commentary, which included notes on nine plays with a glossary, in 1774.
This he afterwards recalled, and the publication of the complete work, Notes and Various Readings of Shakespeare (1779–1783), the third volume of which bears the title of The School of Shakespeare, was completed, under the superintendence of John Collins, in 1783, two years after the author's death.
It contains the results of his unremitting labour for thirty years, and throws considerable light on the history of the times of Shakespeare, as well as on the sources from which he derived his plots.
Besides the works already specified, he published an edition of Antony and Cleopatra, adapted for the stage with the help of David Garrick in 1758.