Collier chose criminality because he believed he would not be taken seriously on his own merits, even though it was well known that he had been friends with Keats, his father had entertained Wordsworth and other luminaries at the family home, and he had tutored Singer and Knight to some extent in perfectly legitimate editorial method. Nevertheless, entrusted with valuable mss. and books, he forged names and signatures and commentary in an unconvincing secretary hand. His greatest crime was his interpolation of neo-seventeenth-century marginalia in the "Perkins Folio," a copy of F2, ruining it forever. He was discovered and excoriated. Oddly, the emendations he forged were good and tenable conjectures, and would have been acceptable in book form or as part of an edition under his own name, without the folderol travesty of "Tho. Perkins." He published four Shakespeare collections and the first is usually the one that scholars consult. Because his chicanery was so intertwined with his second and third editions, scholars often quote them because, like it or not, they are part of the textual history of the plays. Some later scholars adapted those emendations in their published editions. The fourth edition (1878) was advertised as a clean break from the past, though he sometimes defends "Perkins folio" materials.
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Univeristy of Delaware page on the Collier Controversy
Terry Gray's page on Collier
Reasons for a New Edition (1842)
Notes and Emendations to the Text of Shakespeare's Plays from Early Manuscript Corrections in a Copy of the Folio, 1632 (1853)