Encyclopædia Britannica it is scarcely used, and reviewers have recommended that it be dropped from the encyclopaedia. The also has color transparencies of human anatomy and several appendices listing the staff members, advisors, and contributors to all three parts of the Britannica. Taken together, the and comprise roughly 40 million words and 24,000 images. The two-volume index has 2,350 pages, listing the 228,274 topics covered in the "Britannica", together with 474,675 subentries under those topics. The "Britannica" generally prefers British spelling over American; for example, it uses "colour" (not "color"), "centre" (not "center"), and "encyclopaedia" (not "encyclopedia"). However, there are exceptions to
Encyclopædia Britannica First Edition who was offered 200 pounds sterling to produce the encyclopedia in 100 parts (called "numbers" and equivalent to thick pamphlets), which were later bound into three volumes. The first number appeared on 6 December 1768 in Edinburgh, priced sixpence or 8 pence on finer paper. The "Britannica" was published under the pseudonym "A Society of Gentlemen in Scotland", possibly referring to the many gentlemen who had bought subscriptions. By releasing the numbers in weekly installments, the "Britannica" was completed in 1771, having 2,391 pages. The numbers were bound in three equally sized volumes covering Aa–Bzo, Caaba–Lythrum, and Macao–Zyglophyllum; an estimated