 Finally, the end pages contain advertisements for other products sold by A & C. Black, such as atlases and travel guides, and advertisements encouraging subscribers to continue their enrollments.The landmark ninth edition, often called "the Scholar's Edition", was published from January 1875 to 1889 in 25 volumes, with volume 25 the index volume.Unlike the first two Black editions, there were no preliminary dissertations, the alphabetical listing beginning in volume 1.