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 became more apparent from day to day. It had been supposed that the old titles might pass with slight examination: they proved to require the most careful revision; and the work of the revisers needed to be in its turn revised. Subject to a reference to Mr. Panizzi in extreme cases, Mr. Jones was the ultimate authority. His clear head, legal habit of mind, and attention to minute bibliographical accuracy, rendered him invaluable in this capacity, and his decisions constitute the basis and most essential part of the body of unprinted law which unforeseen exigencies gradually superinduced upon the original rules. He also took a leading part in the revision of the proofs. The causes of the suspension of the printing of the catalogue have been so fully treated by the writer in a paper at the Cambridge meeting of the Library Association, that it is needless to enter upon them here. It made no difference to the amount of Mr. Jones's labours, except as regarded the correction of the press. He continued to work upon the catalogue and also upon the supplementary catalogue of books added to the library, both as reviser and as general supervisor, until he became Keeper of Printed Books in 1856. His other duties were numerous and important: he exercised, in particular, the immediate control of the attendants, a responsibility the more onerous in proportion to the continual increase of the establishment. In 1843 he was engaged along with Mr. Watts in collecting the materials on which Mr. Panizzi based his famous report on the deficiencies of the library, which ultimately occasioned