Rear wrapper on the earlier parts printed in blue and red ink. When this early part was published Harpers did not know the final number of parts that would be required to complete the work, estimating them only at "about 50 numbers at 25 cents each." On this wrapper Harpers repeated their assertion made in their prospectus that "The great superiority of early proof impressions,from the Engravings, will ensure to those who take the work in Numbers the possession of in THE HIGHEST STATE OF PERFECTION."