This edition by Thomas Hutchinson (1905) with corrections and updating, contains every poem and fragment of Shelley's verse that had hitherto appeared in print. The text is based on Mary Shelley's two editions of 1839, but Thomas Hutchinson made a fresh collation of the early editions, indicating in footnotes departures from these originals. Shelley's antiquated or eccentric spellings have been modernized except where required by rhyme or metre. The original pointing has been retained except where it tends to obscure or distort the poet's meaning. In addition to Mrs. Shelley's notes, there are headnotes to each poem, giving details of its composition and publication, and a list of the principal editions of Shelley's works.