This act will be found in the United States Statutes at Large, Vol. 20, p. 171. It would be well if the term "periodical" were added to the list of objects to be protected, to avoid all risk of a failure to punish the mutilation of newspapers and magazines, by pleading technical points, of which lawyers are prone to avail themselves in aiding offenders to escape conviction. It will be observed, that the word "deface," employed in this statute, actually covers the marking of margins by any reader, all such marking constituting a defacement within the meaning of the law. While the great multitude of readers who frequent our public libraries are honest and trustworthy, there are always some who are conspicuously the reverse. It is rarely safe in a large public library to admit readers to the shelves, without the company or the surveillance of an attendant. And it is not alone the uncultivated reader who cannot be trusted; the experience of librarians is almost uniform to the effect that literary men, and special scholars, as well as the collectors of rare books, are among those who watch the opportunity to purloin what they wish to save themselves the cost of buying. Sometimes, you may find your most valuable work on coins mutilated by the abstraction of a plate, carried off by some student of numismatics. Sometimes, you may discover a fine picture or portrait abstracted from a book by some lover of art or collector of portraits. Again, you may be horrified by finding a whole sermon torn out of a volume of theology by a theological student or even a clergyman. All these things have happened, and are liable to happen again. No library is safe that is not closely watched and guarded. In the Astor library a literary man actually tore out sixty pages of the _Revue de Paris_, and added to the theft the fraud of plagiarism, by translating from the stolen leaves an article which he sold to Appleton's Journal as an original production! In this case, the culprit, though detected, could not be punished, the law of New York requiring the posting in the library of the statute prohibiting mutilation or other injury to the books, and this posting had not been done. The law has since been amended, to make the penalties absolute and unconditional. In the Astor Library, over six hundred volumes were discovered to have been mutilated, including art works, Patent office reports, magazines, newspapers, and even encyclopaedias. The books stolen from that library had been many, until several exposures and punishment of thieves inspired a wholesome dread of a similar fate.