In September, 1852, in company with Mr. Henry Stevens, the American book agent, Panizzi visited Oxford, Dublin, and Cork, and rendered signal service to the Library by his unsparing exertions to detect defaulters, and uphold the interests of the Museum. Amongst his remarks when in Dublin was one that he “saw a number of important new works exposed for sale of which he did not know the existence, and even in the case of publications of no great general importance, he noticed many which ought to be in the National Collection.” Innumerable difficulties met him in his task. At Derby, “There are,” he says, “many works published, but the two principal publishers having a house in London, it is this house which, should it be necessary, will be held responsible for the infringement of the Copyright Act.” Of course, his presence was in all places which he visited attended with dislike; and it seems hardly fair that, whilst acting from the purest motives in the public service, any obloquy of a personal nature should have attached to him; yet, to say the least, had not a sense of duty sustained him, his would have been a most thankless errand. Any attempt at times to preserve an _incognito_ was unavailing—a rather undesirable fact which he soon discovered, as his person was well known. However, on the 9th of October, 1852, a report from Panizzi was read at a committee, when the thanks of the Trustees were accorded to him for his exertions. Many special cases of the actions which Panizzi brought against publishers are worth recounting, but as their details are necessarily very similar, and, as to the general reader such repetitions would not be of any interest, the biographer contents himself with making special allusion to the most troublesome opponent who ever entered the lists against Panizzi, this was Mr. Bohn, the publisher, and bitter were the denunciations hurled at Panizzi’s devoted head in the course of the hearing of seventeen distinct summonses before Mr. Jardine, the Magistrate, by Mr. Ballantine, the counsel for Mr. Bohn. _Harsh_, _vexatious_, _tyrannical_, were a few of the adjectives which dropped from the lips of that learned gentleman. Mr. Bodkin appeared for the British Museum Authorities, and finally, Mr. Jardine, with encomiums on the personal worth of both the disputants, considered nominal penalties with costs sufficient to meet the exigencies of the case.