ntre of the trade in such material in England at this period was Holywell Street, off the Strand, London. An important publisher of erotic material in the early 19th century was George Cannon (1789–1854), followed in mid-century by William Dugdale (1800–1868) and John Camden Hotten (1832–1873).[48]An important and entertaining conspectus and evaluation of 19th-century (pre-1885) and earlier underground erotica, from the author's own private archive, is provided by Victorian writer Henry Spencer Ashbee, using the pseudonym "Pisanus Fraxi", in his bibliographical trilogy Index Librorum Prohibitorum (1877), Centuria Librorum Absconditorum (1879) and Catena Librorum Tacendorum (1885). His plot summaries of the works he discusses in these privately printed volumes are themselves a contribution to the genre. Originally of very limited circulation, changing attitudes have led to his work now being widely available.[49][50]Notable European works of erotica at this time were Gamiani, or Two N