About 1873 Kohut began to compile his "Dictionary of the Talmud", entirely in German, encouraged by the promise of a Christian nobleman to bear all costs of publication. He had proceeded as far as the third letter of the alphabet when he found that the work was assuming such gigantic proportions as to preclude the possibility of its being confined within the projected limits. Arduous as the merely mechanical labor of copying the manuscript was, he rewrote what he had written, intending to publish the original text of the old " 'Aruk," with a German commentary. On the advice of Leopold Zunz and Salomon Buber, however, who argued that the " 'Aruk," being a national classic, ought to be compiled in Hebrew throughout, he again rewrote the work in that language, the labor of copying occupying two more years. It is this trait of untiring patience, which scorned all obstacles, that made the publication of vol. I, in 1878, possible. His Maecenas, in the meantime, had died, and Kohut was left to bear the burden of expense alone, save for the subvention of the Academy of Sciences in Vienna and of the Cultusministerium in Berlin. He called his work "Aruch Completum" or " 'Aruk ha-Shalem," and its production occupied twenty-five years of his life. The first four volumes were printed during his residence in Hungary, and the last four during his sojourn in America, covering a period of fourteen years (Vienna, 1878–92); the supplement appearing from a New York press; and the whole work aggregating more than 4,000 double-column pages. Seven manuscripts of the " 'Aruk" were used by the editor in determining the etymology of the words, and countless doubtful and corrupted passages in the Talmud were thus corrected and restored. Kohut identified in an elaborate special study (printed in the supplement) the often unacknowledged sources of Nathan ben Jehiel's information, though everywhere defending him against the charge of plagiarism. The " 'Aruk" has been justly characterized as one of the monuments of Hebrew literature.