Cary Nelson, president of the American Association of University Professors, said on Thursday that academic freedom was infringed by Yale University Press when it removed previously published images depicting the Prophet Muhammad from a forthcoming book, The Cartoons That Shook The World, by a Brandeis University scholar. The press was concerned that the images might incite violence; Mr. Nelson said in a written statement that the action has "the potential to encourage broader censorship of speech by faculty members."