How did the structure of Masonic degrees evolve over time?

Prior to the eighteenth century, operative lodges practiced a single simple form of initiation that communicated the Masons' word, grips, and signs alongside the reading of the Old Charges 4. This single ceremony reflected three basic statuses within the lodge structure: Apprentice, Fellow or full member, and Master 1.

Following the creation of the Grand Lodge of England in 1717, speculative leadership expanded this single form into a multi-degree system 34. Between 1717 and 1730, the ritual grew into three distinct Craft degrees: Entered Apprentice, Fellow Craft, and Master Mason 14. The Master Mason degree developed gradually and was initially confined to those who had served as Master of a lodge 12. Scottish lodge records, such as those of Mary's Chapel in Edinburgh, show the Fellow Craft and Master Mason degrees being conferred together in a single communication by 1738 2.

As the three Craft degrees reached their modern form, ritualists viewed the symbolic narrative as incomplete, leading to the development of additional degrees 3. In the Royal Arch, the degree was introduced to complete the legend left unfinished in the Craft 31. Eligibility for the Royal Arch originally required a candidate in England to be a Past Master, which prompted the creation of a virtual "Passing the Chair" ceremony for those who had not held actual lodge office, though access was later opened to Master Masons generally 1. In Scotland, Royal Arch Masonry developed as an independent system under the Grand Chapter formed in 1817, operating outside the official recognition of the Grand Lodge 1.